How To Increase SMTP Debug Logging - MTA

How To Increase SMTP Debug Logging - MTA

   KB 21884        Last updated on 2021-05-24  

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How To Increase SMTP Debug Logging - MTA


1) You can obtain this by modifying the

On ZCS v8.6 and Old: Modify "/opt/zimbra/postfix/conf/"
On ZCS v8.7.x and Above: Modify "/opt/zimbra/common/conf/"

2) Go to the smtpd line and at the end of the line add -vv

smtp      inet  n       -       n       -       -       smtpd -vv 

3) Restart the MTA service.

zmmtactl restart 

4) Check log file "/var/log/zimbra.log"

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Verified Against: Zimbra Collaboration 9.0, 8.8, 8.7, 8.6 Date Created: 04/26/2015
Article ID: Date Modified: 2021-05-24

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Wiki/KB reviewed by SME1 SME2 Copyeditor Last edit by Heera Singh Koranga
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