We are maintaiing zimbra mail server zcs-Network-edition in our network, for the external delivery we use the upstream MTA of the service provider the service provider also takescare of email security (firewall).
Presently the file being created under /opt/zimbra/postfix/conf/relay_password and put the maps for smarthost relays in it. Just few hours ago upgraded to zcs-Network-8.0.3 and upgrade got successful but the problem is we are not able to send the email to the external domains .
Have tried all the below
Create file /opt/zimbra/postfix/conf/relaybysender and put the maps for smarthost relays in
Postfix settings will get overwritten with every upgrade of Zimbra, so if you want to be consistent, keep as much settings within Zimbra.
Smarthost for MTA can get configured withing Zimbra admin under
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