ZCS Administrator's Guide 7.2.3
ZCS Administrator's Guide 7.2.3
Open Source Edition


Zimbra MTA > Zimbra MTA Deployment

Zimbra MTA Deployment
ZCS includes a precompiled version of Postfix. This version does not have any changes to the source code, but it does include configuration file modifications, additional scripts, and tools.
Postfix performs the Zimbra mail transfer and relay. It receives inbound messages via SMTP, and hands off the mail messages to the Zimbra server via LMTP, as shown in figure. The Zimbra MTA can also perform anti-virus and anti-spam filtering.
Postfix also plays a role in transfer of outbound messages. Messages composed from the Zimbra web client are sent by the Zimbra server through Postfix, including messages sent to other users on the same Zimbra server.
Postfix in a Zimbra Environment
*Edge MTA
The term edge MTA is a generic term referring to any sort of edge security solution for mail. You may already deploy such solutions for functions such as filtering. The edge MTA is optional. Some filtering may be duplicated between an edge MTA and the Zimbra MTA.
Postfix Configuration Files
Zimbra modified the following Postfix files specifically to work with ZCS:
*
main.cf. Modified to include the LDAP tables. The configuration script in the Zimbra MTA pulls data from the Zimbra LDAP and modifies the Postfix configuration files.
*
master.cf. Modified to use Amavisd-New.
Important: Do not modify the Postfix configuration files directly! Some of the Postfix files are rewritten when changes are made in the administration console. Any changes you make will be overwritten.
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