How to get warning email if email is delayed and deferred

How to get warning e-mail if e-mail is delayed and deferred?

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Problem

How to get warning e-mail if e-mail is delayed and deferred

Solution

We need to configure "zimbraMtaDelayWarningTime" attribute to achieve this.

For example, want to get the warning email in exact five minutes if the e-mail is deferred, then following is the command need to execute on MTA server:

 # su - zimbra
 $ zmprov ms `zmhostname` zimbraMtaDelayWarningTime 5m

Restart the MTA service:

 $ zmmtactl restart

If the warning message needed after 4 hours, then specify "4h".

Example of warning message:

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This is the mail system at host mail.domain.com.
####################################################################
# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
####################################################################

Your message could not be delivered for more than 0 hour(s).
It will be retried until it is 5 day(s) old.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
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