This parameter can be changed in Qmail's control directory. The default setting is to keep attempting to send an email for 7 days. The parameter value is seconds.

If you only wanted to keep emails for 4 days: 4 days * 24 hours * 60 minutes * 60 seconds would equal 345600.

• /bin/qmail-showctl | grep life
• queuelifetime: (Default.) Message lifetime in the queue is 604800 seconds.
• echo 345600 > queuelifetime
• /etc/init.d/qmail restart
• qmail-showctl | grep life
• queuelifetime: Message lifetime in the queue is 345600 seconds.

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