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Version 5,6 e 7 Tested

Configuring transport tables to relay emails to a different mail server. In this example I am forwarding all emails for otherdomain.com to smtp.otherdomain.com . You can add as many transport maps as you need. All commands should be run as a user 'zimbra'. After 5.0.9, postfix_transport_maps has been modified a bit, so we'll show both ways.

$ zmlocalconfig   |grep -i postfix_transport_maps

This will show you the current transport maps file configuration:

postfix_transport_maps = ldap:/opt/zimbra/conf/ldap-transport.cf

or for Zimbra 5.0.9 and higher (including 6.0):

postfix_transport_maps = proxy:ldap:/opt/zimbra/conf/ldap-transport.cf

Create your transport file (owner/group-owner should be zimbra):

vi /opt/zimbra/postfix/conf/transportfile
otherdomain.com     :[smtp.otherdomain.com]

You can also add multiple transport maps, for example:

mydomain.com     :[mail.otherdomain.com]
mydomain.org     :[mail.otherdomain.com]
hisdomain.net    :[mail.otherdomain.com]

In this example all emails for 3 different domains will go to mail.otherdomain.com, so destination will be changed, while user name will remain as in original email address.

Convert the transport file into maptype database file:

$ postmap /opt/zimbra/postfix/conf/transportfile

The file transportfile.db will be created in this directory. Define the new transport file (original, not *.db one) BEFORE the default one. Run:

$ zmlocalconfig -e postfix_transport_maps="hash:/opt/zimbra/postfix/conf/transportfile ldap:/opt/zimbra/conf/ldap-transport.cf"

Or for Zimbra 5.0.9 and higher:

$ zmlocalconfig -e postfix_transport_maps="hash:/opt/zimbra/postfix/conf/transportfile proxy:ldap:/opt/zimbra/conf/ldap-transport.cf"

Finally, make sure that the relay_domains parameter in main.cf contains all domains handled by the server, whether locally or relayed elsewhere:

$ vi /opt/zimbra/postfix/conf/main.cf
relay_domains = otherdomain.com, mydomain.com, mydomain.org, hisdomain.net, locallyhandleddomain.com, localaliaseddomain.com

Restart Zimbra:

zmcontrol stop
zmcontrol start
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