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Bypass Host Resolution Issues For Inbound Mail

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Zimbra uses the LMTP protocol for inbound mailstore delivery. By default, Zimbra's Postfix MTA will use DNS for mailbox server host resolution. Use this tip to bypass DNS inbound delivery from the MTA to mailstore.

$ su - zimbra

Query the existing Postfix value
$ postconf lmtp_host_lookup
lmtp_host_lookup = dns

Edit /etc/hosts
10.1.1.1 mailstore.server.com

Modify main.cf
$ postconf -e lmtp_host_lookup=native

Update Zimbra's local configuration for upgrade persistence
zmlocalconfig -e postfix_lmtp_host_lookup=native