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It is possible to manaully delete messages from the mail queue.

B693A1601A9   154654 Thu Mar  1 16:20:22  username@domain.tld
                (connect to[]:25: Connection timed out)

Would be removed by postsuper -d B693A1601A9.

Is it possible to manually bounce messages from the mail queue?

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up vote 1 down vote accepted

No. It is not possible, as there is only minimal need of doing manual queue management. There are configuration parameters for doing it automatically: and (but remember the fatal downside of reducing bounce_queue_lifetime)

The best way would be to notify the sender about the delay and just wait until it bounces on its own:

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