Introduction |
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xxiii | |
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Chapter 1 Introduction to Email Security |
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1 | (28) |
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Overview of Cisco IronPort Email Security Appliance (ESA) |
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1 | (3) |
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3 | (1) |
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Security Management Appliances (SMA) |
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3 | (1) |
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History of AsyncOS Versions |
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4 | (2) |
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5 | (1) |
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6 | (3) |
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6 | (1) |
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7 | (1) |
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Protecting Intellectual Property and Preventing Data Loss |
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8 | (1) |
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Other Email Security Threats |
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9 | (1) |
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Simple Mail Transfer Protocol (SMTP) |
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9 | (18) |
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14 | (1) |
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15 | (1) |
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SMTP Message Headers and Body |
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16 | (1) |
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Envelope Sender and Recipients |
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17 | (1) |
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18 | (2) |
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20 | (1) |
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21 | (1) |
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Domain Name Service (DNS) and DNS MX Records in IPv4 and IPv6 |
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22 | (1) |
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Message Transfer Agents (MTA) |
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23 | (1) |
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24 | (1) |
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Relaying Mail and Open Relays |
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24 | (1) |
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Bounces, Bounce Storms, and Misdirected Bounces |
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25 | (1) |
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Directory Harvest Attacks |
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26 | (1) |
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27 | (2) |
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Chapter 2 ESA Product Basics |
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29 | (30) |
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29 | (2) |
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30 | (1) |
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31 | (1) |
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31 | (1) |
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Basic Setup via the WUI System Setup Wizard |
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31 | (12) |
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Connecting to the ESA for the First Time |
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31 | (1) |
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Running the System Setup Wizard |
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32 | (6) |
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38 | (1) |
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LDAP Wizard and Next Steps |
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39 | (2) |
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Examining the Basic Configuration |
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41 | (1) |
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41 | (1) |
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42 | (1) |
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Networking Deployment Models |
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43 | (9) |
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Interfaces, Routing, and Virtual Gateways |
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43 | (4) |
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Single Versus Multinetwork Deployment |
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47 | (1) |
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Routing on Multinetwork Deployments |
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48 | (1) |
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49 | (1) |
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50 | (1) |
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Securing Network Interfaces |
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51 | (1) |
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Security Filtering Features |
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52 | (6) |
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SenderBase and Reputation Filters |
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53 | (1) |
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54 | (1) |
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55 | (3) |
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58 | (1) |
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Chapter 3 ESA Email Pipeline |
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59 | (28) |
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59 | (11) |
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61 | (2) |
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Host Access Table (HAT) and Reputation Filters |
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63 | (2) |
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Rate Limiting with Mail Flow Policies |
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65 | (2) |
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67 | (1) |
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67 | (1) |
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Recipient Access Table and LDAP Accept |
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67 | (3) |
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Recipient and Sender Manipulation |
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70 | (2) |
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Default Domain, Domain Map, and Aliases |
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70 | (1) |
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71 | (1) |
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72 | (1) |
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72 | (1) |
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LDAP Routing and Masquerading |
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73 | (1) |
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73 | (1) |
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Work Queue and Filtering Engines |
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73 | (6) |
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74 | (1) |
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Incoming and Outgoing Mail Policies |
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74 | (1) |
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75 | (1) |
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75 | (1) |
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76 | (1) |
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77 | (1) |
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78 | (1) |
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78 | (1) |
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79 | (6) |
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Selecting the Delivery Interface (Virtual Gateways) |
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80 | (1) |
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81 | (1) |
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81 | (1) |
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82 | (1) |
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Selecting Bounce Profiles |
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83 | (1) |
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Handling Delivery Errors with Bounce Profiles |
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84 | (1) |
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85 | (1) |
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85 | (2) |
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Chapter 4 ESA Web User Interface |
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87 | (38) |
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87 | (1) |
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87 | (1) |
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88 | (30) |
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88 | (1) |
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89 | (1) |
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89 | (1) |
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90 | (1) |
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90 | (1) |
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90 | (1) |
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90 | (1) |
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91 | (1) |
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91 | (1) |
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91 | (1) |
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92 | (1) |
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92 | (1) |
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92 | (1) |
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92 | (1) |
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93 | (1) |
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93 | (1) |
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93 | (1) |
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94 | (1) |
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94 | (1) |
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95 | (1) |
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95 | (1) |
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96 | (1) |
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96 | (1) |
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Host Access Table (HAT) Overview |
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96 | (1) |
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97 | (1) |
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97 | (1) |
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Recipient Access Table (RAT) |
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97 | (1) |
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97 | (1) |
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98 | (1) |
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98 | (1) |
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99 | (1) |
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99 | (1) |
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99 | (1) |
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99 | (1) |
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100 | (1) |
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100 | (1) |
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101 | (1) |
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101 | (1) |
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IronPort Email Encryption |
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101 | (1) |
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101 | (1) |
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102 | (1) |
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102 | (1) |
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103 | (1) |
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103 | (1) |
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103 | (1) |
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103 | (1) |
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104 | (1) |
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105 | (1) |
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105 | (1) |
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105 | (1) |
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106 | (1) |
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106 | (1) |
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106 | (1) |
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106 | (1) |
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107 | (1) |
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107 | (1) |
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107 | (1) |
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System Administration Menu |
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108 | (1) |
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108 | (1) |
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109 | (1) |
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109 | (1) |
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109 | (1) |
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110 | (1) |
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110 | (1) |
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111 | (1) |
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111 | (1) |
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Time Zone and Time Settings |
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111 | (1) |
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112 | (1) |
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Feature Keys and Feature Key Settings |
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112 | (1) |
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112 | (1) |
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113 | (1) |
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113 | (1) |
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114 | (1) |
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114 | (1) |
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115 | (1) |
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115 | (1) |
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115 | (1) |
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115 | (1) |
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116 | (1) |
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116 | (1) |
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116 | (1) |
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117 | (1) |
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117 | (1) |
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118 | (1) |
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WUI with Centralized Management |
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118 | (4) |
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119 | (2) |
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Modify CM Options in the WUI |
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121 | (1) |
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Modifying Cluster Settings |
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121 | (1) |
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122 | (1) |
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122 | (1) |
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123 | (1) |
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123 | (2) |
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Chapter 5 Command-Line Interface |
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125 | (62) |
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Overview of the ESA Command-Line Interface |
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125 | (1) |
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Using SSH or Telnet to Access the CLI |
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125 | (9) |
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PuTTY on Microsoft Windows |
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127 | (2) |
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129 | (3) |
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132 | (1) |
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Committing Configuration Changes |
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133 | (1) |
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Keeping the ESA CLI Secure |
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134 | (7) |
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135 | (1) |
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Creating and Using SSH Keys for Authentication |
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136 | (4) |
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140 | (1) |
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Restricting Access to SSH |
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140 | (1) |
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141 | (5) |
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142 | (1) |
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142 | (4) |
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146 | (40) |
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146 | (1) |
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Status and Performance Commands |
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146 | (10) |
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Command Listing by Functional Area |
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156 | (1) |
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Mail Delivery Troubleshooting |
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156 | (1) |
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156 | (1) |
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157 | (1) |
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Performance and Statistics |
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158 | (1) |
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159 | (1) |
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Queue Management and Viewing |
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160 | (1) |
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Configuration File Management |
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161 | (1) |
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AsyncOS Version Management |
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162 | (1) |
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Configuration Testing Commands |
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163 | (1) |
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163 | (2) |
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General Administration Commands |
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165 | (1) |
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166 | (1) |
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Configuration Listing by Functional Area |
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167 | (1) |
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167 | (1) |
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168 | (7) |
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Mail Routing and Delivery |
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175 | (1) |
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176 | (1) |
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Managing Users and Alerts |
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177 | (1) |
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Configuring Global Engine and Services Options |
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177 | (2) |
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179 | (1) |
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Configuration for External Communication |
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179 | (1) |
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180 | (1) |
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181 | (2) |
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Hidden/Undocumented Commands |
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183 | (3) |
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186 | (1) |
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Chapter 6 Additional Management Services |
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187 | (32) |
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The Need for Additional Protocol Support |
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187 | (1) |
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Simple Network Management Protocol (SNMP) |
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188 | (5) |
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188 | (1) |
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189 | (1) |
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189 | (1) |
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190 | (1) |
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Monitoring Recommendations |
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191 | (2) |
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Working with the ESA Filesystem |
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193 | (3) |
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196 | (10) |
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196 | (1) |
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Administrative and Auditing Logs |
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197 | (1) |
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198 | (1) |
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199 | (2) |
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201 | (1) |
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Creating a Log Subscription |
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202 | (1) |
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202 | (1) |
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Transferring Logs for Permanent Storage |
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203 | (1) |
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204 | (1) |
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204 | (1) |
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204 | (1) |
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205 | (1) |
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205 | (1) |
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Understanding IronPort Text Mail Logs |
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206 | (11) |
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206 | (1) |
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Lifecycle of a Message in the Log |
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207 | (2) |
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209 | (2) |
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211 | (1) |
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A Practical Example of Log Parsing |
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212 | (3) |
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215 | (2) |
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217 | (2) |
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Chapter 7 Directories and Policies |
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219 | (28) |
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219 | (2) |
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The Need for Directory Integration |
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220 | (1) |
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220 | (1) |
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221 | (2) |
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223 | (18) |
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Advanced Profile Settings |
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225 | (1) |
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226 | (1) |
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Recipient Validation with LDAP |
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227 | (2) |
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Recipient Routing with LDAP |
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229 | (1) |
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230 | (1) |
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231 | (2) |
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233 | (1) |
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233 | (1) |
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234 | (1) |
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234 | (5) |
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239 | (2) |
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Incoming and Outgoing Mail Policies |
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241 | (1) |
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241 | (1) |
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241 | (1) |
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242 | (3) |
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Using Group Queries for Routing |
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242 | (2) |
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Per-Recipient Routing with AD and Exchange |
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244 | (1) |
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Using Group Queries for Recipient and Sender Validation |
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244 | (1) |
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245 | (2) |
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Chapter 8 Security Filtering |
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247 | (32) |
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247 | (1) |
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248 | (1) |
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Reputation Filters and SenderBase Reputation Scores |
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248 | (3) |
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Enabling Reputation Filters |
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249 | (1) |
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250 | (1) |
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250 | (1) |
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HAT Policy Recommendations |
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250 | (1) |
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IronPort Anti-Spam (IPAS) |
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251 | (6) |
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252 | (1) |
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253 | (1) |
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254 | (1) |
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255 | (2) |
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Recommended Anti-Spam Settings |
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257 | (2) |
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257 | (1) |
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258 | (1) |
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Actions for the Middle-of-the-Road |
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258 | (1) |
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Actions for the Conservative |
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258 | (1) |
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Outgoing Anti-Spam Scanning |
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259 | (1) |
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Sophos and McAfee Antivirus (AV) |
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259 | (7) |
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260 | (2) |
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262 | (1) |
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263 | (1) |
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263 | (1) |
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264 | (2) |
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IronPort Outbreak Filters (OF) |
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266 | (4) |
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267 | (1) |
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267 | (1) |
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268 | (1) |
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269 | (1) |
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270 | (1) |
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270 | (3) |
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Incoming AV Recommendations |
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271 | (1) |
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Outgoing AV Recommendations |
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272 | (1) |
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Using Content Filters for Security |
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273 | (5) |
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Attachment Conditions and Actions |
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273 | (3) |
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276 | (1) |
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Filtering Subject or Body |
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277 | (1) |
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278 | (1) |
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Chapter 9 Automating Tasks |
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279 | (30) |
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Administering ESA from Outside Servers |
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279 | (1) |
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280 | (7) |
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281 | (1) |
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281 | (2) |
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283 | (2) |
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CLI Automation from Microsoft Windows Servers |
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285 | (2) |
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287 | (1) |
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Polling Data from the ESA |
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287 | (5) |
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Retrieving XML Data Pages |
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287 | (3) |
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Using XML Export for Monitoring |
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290 | (2) |
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Pushing Data to the ESA and Making Configuration Changes |
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292 | (6) |
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Changing Configuration Settings Using the CLI |
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293 | (2) |
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Committing Changes Using the CLI |
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295 | (1) |
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Changing Configuration Settings Using the WUI |
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296 | (2) |
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Committing Changes Using the WUI |
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298 | (1) |
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Retrieving Reporting Data from the WUI |
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298 | (10) |
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299 | (3) |
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302 | (3) |
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305 | (3) |
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308 | (1) |
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Chapter 10 Configuration Files |
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309 | (18) |
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ESA and the XML Configuration Format |
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309 | (1) |
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Configuration File Structure |
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310 | (3) |
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Importing and Exporting Configuration Files |
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313 | (3) |
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314 | (1) |
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315 | (1) |
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Editing Configuration Files |
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316 | (4) |
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Duplicating a Configuration |
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317 | (1) |
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Partial Configuration Files |
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318 | (2) |
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Automating Configuration File Backup |
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320 | (1) |
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Configuration Backup via CLI |
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320 | (1) |
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Configuration Backup via WUI |
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321 | (2) |
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Configuration Files in Centralized Management Clusters |
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323 | (2) |
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325 | (2) |
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Chapter 11 Message and Content Filters |
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327 | (50) |
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Filtering Email Messages with Custom Rules |
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327 | (7) |
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Message Filters Versus Content Filters |
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328 | (3) |
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331 | (1) |
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332 | (1) |
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332 | (1) |
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333 | (1) |
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Handling Multirecipient Messages |
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334 | (1) |
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Availability of Conditions and Actions |
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334 | (1) |
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334 | (6) |
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Conditions That Test Message Data |
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335 | (1) |
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Operating on Message Metadata |
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336 | (1) |
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337 | (2) |
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339 | (1) |
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Miscellaneous Filter Conditions |
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340 | (1) |
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340 | (5) |
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340 | (1) |
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341 | (2) |
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Affecting Message Delivery |
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343 | (1) |
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Altering Message Processing |
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344 | (1) |
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Miscellaneous Filter Actions |
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344 | (1) |
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345 | (2) |
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Regular Expressions in Filters |
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347 | (3) |
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350 | (1) |
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351 | (1) |
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352 | (2) |
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353 | (1) |
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Smart Identifier Best Practices |
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354 | (1) |
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Content Filter and Mail Policy Interaction |
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354 | (5) |
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Filter Performance Considerations |
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359 | (3) |
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Improving Filter Performance |
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360 | (2) |
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362 | (14) |
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362 | (1) |
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Basic Message Attribute Filters |
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363 | (1) |
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Body and Attachment Scanning |
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364 | (2) |
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Complex Combinatorial Logic with Content Filters |
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366 | (1) |
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Routing Messages Using Filters |
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367 | (1) |
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Integration with External SMTP Systems |
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368 | (1) |
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369 | (2) |
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371 | (1) |
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Delivering to Multiple External Hosts |
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371 | (2) |
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Interacting with Security Filters |
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373 | (2) |
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375 | (1) |
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376 | (1) |
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Chapter 12 Advanced Networking |
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377 | (36) |
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ESA with Multiple IP Interfaces |
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377 | (9) |
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378 | (2) |
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380 | (1) |
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Adding New Interfaces and Groups |
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381 | (1) |
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Using Virtual Gateways for Email Delivery |
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382 | (3) |
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Virtual Gateways and Listeners |
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385 | (1) |
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386 | (2) |
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Separating Incoming and Outgoing Mail |
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386 | (1) |
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Multiple Outgoing Mail Listeners |
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386 | (1) |
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Separate Public MX from Submission |
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387 | (1) |
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388 | (2) |
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Other Advanced Configurations |
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390 | (21) |
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390 | (2) |
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392 | (1) |
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Using and Enforcing TLS When Delivering Email |
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393 | (3) |
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Using and Enforcing TLS When Receiving Email |
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396 | (1) |
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397 | (1) |
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398 | (1) |
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Adding Certificates to the ESA |
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399 | (3) |
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TLS Cipher and Security Options |
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402 | (3) |
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405 | (3) |
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Load Balancers and Direct Server Return (DSR) |
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408 | (3) |
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411 | (2) |
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Chapter 13 Multiple Device Deployments |
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413 | (48) |
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General Deployment Guidelines |
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413 | (2) |
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Email Availability with Multiple ESAs |
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415 | (1) |
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Load-Balancing Strategies |
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415 | (9) |
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415 | (1) |
|
Domains Without MX Records |
|
|
416 | (1) |
|
Incoming and Outgoing Mail with MX Records |
|
|
417 | (1) |
|
Single Location with Equal MX Priorities |
|
|
417 | (1) |
|
Multiple Locations with Equal MX Priorities |
|
|
417 | (1) |
|
|
418 | (1) |
|
Disaster Recovery (DR) Sites |
|
|
419 | (1) |
|
|
419 | (1) |
|
Limitations of MX Records |
|
|
420 | (2) |
|
|
422 | (1) |
|
Load Balancers for Inbound Mail |
|
|
422 | (1) |
|
Load Balancers for Outgoing Mail |
|
|
423 | (1) |
|
|
424 | (7) |
|
|
425 | (1) |
|
Three-Tiered Architectures |
|
|
426 | (1) |
|
|
427 | (2) |
|
|
429 | (2) |
|
Architectures with Mixed MTA Products |
|
|
431 | (8) |
|
Integration with External Systems |
|
|
431 | (1) |
|
External Email Encryption |
|
|
432 | (1) |
|
External Data Loss Prevention (DLP) Servers |
|
|
433 | (2) |
|
|
435 | (1) |
|
Archiving Inline or Cul-de-Sac |
|
|
435 | (1) |
|
|
436 | (1) |
|
|
437 | (2) |
|
Introducing, Replacing, or Upgrading ESA in Production |
|
|
439 | (4) |
|
Adding the First ESA to the Environment |
|
|
439 | (1) |
|
Replacing an ESA for Upgrade |
|
|
440 | (3) |
|
Management of Multiple Appliances |
|
|
443 | (16) |
|
Centralized Management Overview |
|
|
443 | (1) |
|
|
444 | (1) |
|
Joining an Existing CM Cluster |
|
|
444 | (2) |
|
Creating and Managing CM Groups |
|
|
446 | (4) |
|
|
450 | (3) |
|
|
453 | (4) |
|
Centralized Management Limitations and Recommendations |
|
|
457 | (1) |
|
|
457 | (1) |
|
Configuration Files in Clusters |
|
|
457 | (1) |
|
Upgrading Clustered Machines |
|
|
457 | (2) |
|
|
459 | (2) |
|
Chapter 14 Recommended Configuration |
|
|
461 | (28) |
|
|
461 | (3) |
|
|
461 | (1) |
|
|
462 | (2) |
|
|
464 | (7) |
|
|
464 | (2) |
|
Whitelisting and Blacklisting |
|
|
466 | (2) |
|
|
468 | (1) |
|
Deciding to Quarantine or Not |
|
|
468 | (1) |
|
End-User Quarantine Access |
|
|
469 | (1) |
|
Administrative-Only Quarantine Access |
|
|
469 | (1) |
|
|
470 | (1) |
|
|
471 | (8) |
|
|
471 | (1) |
|
Outbound Sending Practices |
|
|
472 | (1) |
|
|
473 | (1) |
|
Variable Envelope Return Path |
|
|
474 | (1) |
|
DNS and Sender Authentication |
|
|
475 | (1) |
|
Dealing with Blacklisting |
|
|
475 | (2) |
|
Compromised Internal Sources |
|
|
477 | (2) |
|
|
479 | (3) |
|
Recommendations for Specific Environments |
|
|
482 | (5) |
|
Small and Medium Organizations |
|
|
483 | (1) |
|
Large or Complex Organizations |
|
|
483 | (1) |
|
|
484 | (1) |
|
|
485 | (1) |
|
Email "Front End" to Complex Internal Organizations |
|
|
486 | (1) |
|
|
487 | (2) |
|
Chapter 15 Advanced Topics |
|
|
489 | (28) |
|
|
489 | (1) |
|
|
490 | (14) |
|
Path-Authentication Standards: SPF and SIDF |
|
|
491 | (2) |
|
Determining the Identity of the Sender |
|
|
493 | (1) |
|
|
494 | (1) |
|
|
495 | (1) |
|
Using SPF and SIDF Verification on ESA |
|
|
496 | (2) |
|
Message Authentication: DKIM |
|
|
498 | (1) |
|
Enabling DKIM Signing on ESA |
|
|
498 | (1) |
|
The DKIM-Signature Header |
|
|
499 | (1) |
|
|
499 | (1) |
|
Other DKIM Signing Options |
|
|
500 | (1) |
|
|
501 | (1) |
|
|
501 | (1) |
|
|
502 | (1) |
|
DKIM and SPF Recommendations |
|
|
503 | (1) |
|
|
504 | (2) |
|
|
504 | (1) |
|
Personally Identifiable Information (PII) |
|
|
504 | (1) |
|
|
505 | (1) |
|
Personal Financial Information |
|
|
505 | (1) |
|
|
506 | (1) |
|
Data Loss Prevention (DLP) |
|
|
506 | (9) |
|
Enabling Data Loss Prevention Policies |
|
|
506 | (1) |
|
|
507 | (1) |
|
Taking Action on Matching Messages |
|
|
507 | (2) |
|
|
509 | (1) |
|
|
509 | (3) |
|
|
512 | (1) |
|
Customizing Content Matching on Predefined Policies |
|
|
512 | (1) |
|
Customizing User and Attachment Rules |
|
|
513 | (1) |
|
Integration with Content Filters |
|
|
514 | (1) |
|
|
515 | (2) |
Index |
|
517 | |