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Flush deferred messages in sendmail queue :: Stephan Paukner :: syslog

Posted by jpluimers on 2016/09/12

Be careful with setting the timeout of sendmail to zero when trying to flush the mail queue:

sendmail -OTimeout.hoststatus=0m -q -v

Reason: a lot of target systems do rate-limiting if you retry too much in too short time, for instance gmail does that:

421-4.7.0 [###.###.###.### 15] Our system has detected an unusual rate of
421-4.7.0 unsolicited mail originating from your IP address. To protect our
421-4.7.0 users from spam, mail sent from your IP address has been temporarily
421-4.7.0 rate limited. Please visit
421-4.7.0 to review our Bulk Email
421 4.7.0 Senders Guidelines. w1si28749381wju.16 - gsmtp


via Flush deferred messages in sendmail queue :: Stephan Paukner :: syslog.

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