Relay per Domain

Admin Article

Article Information

This article applies to the following ZCS versions.

ZCS 5.0 Article ZCS 5.0 ZCS 7.0 Article ZCS 7.0 ZCS 8.0 Article ZCS 8.0

Reference bugs: http://bugzilla.zimbra.com/show_bug.cgi?id=32740 and https://bugzilla.zimbra.com/show_bug.cgi?id=95348


Zimbra allows relaying emails to a specific server only, i.e using zimbraMtaRelayHost. However, there are needs to relay emails per domain basis based on the sender. For example, you want emails sent by users@domain1.com should be relayed through smtp.domain1.com and users@domain2.com through smtp.domain2.com servers. You can configure it using postfix's "sender_dependent_relayhost_maps".

This is an example that has been tested on ZCS 5.0.16 and ZCS 7.1.4

Note: Below settings will not survive zimbra upgrades. Make sure you take backup of config files before upgrading.

1. Add following line to /opt/zimbra/postfix/conf/main.cf

Pre 8.5:
sender_dependent_relayhost_maps = hash:/opt/zimbra/postfix/conf/bysender
8.5:
sender_dependent_relayhost_maps = lmdb:/opt/zimbra/postfix/conf/bysender

2. Create file /opt/zimbra/postfix/conf/bysender and enter your domain names and relay server's IP addresses.

@domain1.com  [10.10.10.1]
@domain2.com  [20.20.20.1]

You can even add individual email IDs to relay their emails to specific relay host.

 user@domain.com [10.10.10.2]

3. Create the hash file.

postmap /opt/zimbra/postfix/conf/bysender


4. Restart zmmtactl

zmmtactl stop
zmmtactl start

5. Test by sending emails.



Verified Against: ZCS 5.0.16 Date Created: 6/4/2009
Article ID: https://wiki.zimbra.com/index.php?title=Relay_per_Domain Date Modified: 2015-03-31



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