How to enable Local delivery in Zimbra

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Zimbra Collaboration 8.5 or above

ZCS 8.5 or above onwards this attribute is now in ldap - zimbraMtaLmtpHostLookup 

 zmprov ms mtaserver.com zimbraMtaLmtpHostLookup native

In case that you are using Single Server, be aware always of the Global Config as well: 

 zmprov mcf zimbraMtaLmtpHostLookup native

Once this is done, you'll need to restart the mta: 

 zmmtactl restart


Zimbra Collaboration 8.0 or previous

To lookup lmtp addresses natively instead of by DNS, simply modify the following localconfig values on all mta's: 

 zmlocalconfig -e postfix_lmtp_host_lookup=native

Once this is done, you'll need to restart the mta: 

 zmmtactl restart


Ref:
https://wiki.zimbra.com/wiki/Incoming_Mail_Problems

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