Zimbra Collaboration Administrator Guide Zimbra Collaboration 8.7 Open Source Edition Legal Notices Copyright © 2016 Synacor, Inc. All rights reserved. This product is protected by U.S. and international copyright and intellectual property laws. ZIMBRA is a trademark of Synacor, Inc. in the United States and/or other jurisdictions. All other marks and names mentioned herein may be trademarks of their respective companies. Synacor, Inc. 40 La Riviere Drive, Suite 300 Buffalo, New York 14202 www.synacor.com Zimbra Collaboration 8.7 April 2016 Table of Contents 1 Introduction . 13 Audience . 13 Third-Party Components . 13 Support and Contact Information . 13 2 Product Overview . 15 Architectural Overview . 15 Core Email, Calendar and Collaboration Functionality . 16 Zimbra Components . 16 Zimbra Application Packages . 17 Mail Flow—Multi-Server Configuration . 19 Zimbra System Directory Tree . 20 Zimbra Web Clients . 22 Security Measures . 23 Identity and Access Management . 23 Information Security and Privacy . 24 System Logs . 24 3 Licensing . 27 License Types . 27 License Requirements . 28 License Usage by Account Type . 28 License Activation . 29 Automatic License Activation . 29 Manual License Activation . 29 When Licenses are not Installed or Activated . 29 Obtain a License . 30 Managing Licenses . 30 License Information . 30 License Expiration . 31 Renewal . 31 Updating Your License . 32 4 Zimbra Mailbox Server . 33 Mailbox Server . 33 Message Store . 33 Data Store . 34 Index Store . 34 Web Application Server . 35 Mailstore Services . 35 User Interface Services . 35 Web Application Server Split . 35 Installation and Configuration of the Web Application Server Split . 35 Mailbox Server Logs . 36 5 Zimbra LDAP Service . .37 LDAP Traffic Flow . 37 LDAP Directory Hierarchy . 38 Zimbra Collaboration LDAP Schema . 39 Zimbra Collaboration Objects . 40 Account Authentication. 42 Internal Authentication Mechanism . 42 External LDAP and External AD Authentication Mechanism . 42 Custom Authentication . 43 Kerberos5 Authentication Mechanism . 44 Global Address List . 45 Flushing LDAP Cache . 47 Flush the Cache for Themes and Locales . 47 Flush Accounts, Groups, COS, Domains, and Servers . 47 6 Zimbra Mail Transfer Agent . .49 Incoming Mail Routing Overview . 50 Zimbra MTA Deployment . 50 Postfix Configuration Files . 51 SMTP Authentication . 51 SMTP Restrictions . 51 Sending Non Local Mail to a Different Server . 51 Anti-Virus and Anti-Spam Protection . 52 Anti-Virus Protection . 52 Anti-Spam Protection . 53 Receiving and Sending Mail . 66 Message Queues . 67 7 Zimbra Proxy Server . .69 Benefits of Using Zimbra Proxy . 69 Zimbra Proxy Components . 70 Proxy Architecture and Flow . 70 Changing the Zimbra Proxy Configuration . 71 Zimbra Proxy . ..