SMTP Relay per sender Domain [Zimbra]

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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.



Ref:

https://wiki.zimbra.com/wiki/Relay_per_Domain

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