Relay per Domain

Relay per Domain

   KB 2888        Last updated on 07/12/2015  

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 - This article is a Community contribution and may include unsupported customizations.
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Reference bugs: and

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 should be relayed through and through 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/

Pre 8.5:
sender_dependent_relayhost_maps = hash:/opt/zimbra/postfix/conf/bysender
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.  []  []

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

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: Date Modified: 07/12/2015

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