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sendmail server

Posted on 2009-05-10
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Last Modified: 2013-12-17
Hi all,

My sendmail server (which acts as our mail gateway) has over 8000 emails in the queue and has already been greylisted....

How do i troubleshoot this? Obviously we have been blacklisted for spamming, how do I get off lists and how do I proceed.

Is flushing the queue the only solution? Id hate to do that due to all the legitimate mail that might be in the queue
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Question by:Network_Padawan
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Expert Comment

by:aa789
ID: 24351300
As root, use:

/usr/lib/sendmail -bq

or, if you want to watch the action:

/usr/lib/sendmail -v -bq

However, since you want to clear the queue, and you know that many connections may be slow due to the greylist, you might want to issue many (10 - 20 depending on your cpu speed)

/usr/lib/sendmail -bq &

which will run the queue that many times

You may want to cd to the queue directory (usually /var/spool/mqueue) and grep the qf files ...

grep To: qf* | sort | more

And see which sites are making your queue fill up. Then you could (where foo.com is replaced by the site of interest)

grep foo.com qf* | cut -d: -f1 | sed "s/qf/*f/" >/tmp/qflist
rm `cat /tmp/qflist`

to delete those emails (assuming they're not important, of course). what this did was find the site name in the qf files, isolate the queue file name, and change the queue file name to a wildcard for the queue file name (there will be a qf<id>, df<id> and maybe xf<id> and others.




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Author Comment

by:Network_Padawan
ID: 24351310
Hey thanks.

when I type /usr/lib/sendmail -v -bq  I get:

Invalid operation mode q
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Expert Comment

by:aa789
ID: 24351464
Ooops ...

just

/usr/lib/sendmail -v -q

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Author Comment

by:Network_Padawan
ID: 24351935
Thanks for your help.

Just quickly, so i understand, the sendmail -q processes the queue right? Is this a forced queue? Because I thought sendmail processes the queue automatically
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Accepted Solution

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aa789 earned 2000 total points
ID: 24353595
Yes, this is forcing the queue.

Sendmail runs the queue automatically at a fixed interval. That's the argument to sendmail (example: -q1h, -q15m) which you see when you do a ps <args>  command (args depend on your system). In my case
ps -ef |grep sendmail
show it. But when your queue is overfull, the queue run doesn't finish within your queue interval, so it keeps getting more full. So we force multiple queue runs to get the queue processed.

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Author Closing Comment

by:Network_Padawan
ID: 31580014
Thankyou
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