How To Increase SMTP Debug Logging - MTA

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This article applies to the following ZCS versions. ZCS 8.6 ZCS 8.5 ZCS 8.0

How To Increase SMTP Debug Logging - MTA

You can obtain this by modifying the master.cf.in which is located at /opt/zimbra/postfix/conf . Go to the smtpd line and at the end of the line add -vv

 smtp      inet  n       -       n       -       -       smtpd -vv

restart the mta by running the following

 zmmtactl restart

Logging goes to /var/log/zimbra.log