Massive queue buildup

Brent Addis brent.addis at
Mon Nov 13 22:42:32 GMT 2006

Check your not running one of those massive blacklists from SARE.
I was running one for a while while testing and a similar thing happened. removing it dropped my average scan time from ~2 1/2 minutes to 11 seconds per message. 
Other ideas:
- Check your dns servers are capable of standing up to the amount of dns requests you are making. Running something like nscd locally is a good idea.
- Are you running very many RBL's within mailscanner? Try disabling these and see if it helps.
- Are you running any type of recipient verification? (as in, checking that the person being sent the mail actually exists). If not, try turning it on. I am unsure what it is called within postfix as I don't use it.
- Check out which has a few others as well.
How much mail are you handling a day? I have a couple of single cpu 3.0 ghz machines comfortably handling many thousands of messages a day.


From: mailscanner-bounces at on behalf of Jay Chandler
Sent: Tue 11/14/2006 11:31 AM
To: mailscanner at
Subject: Massive queue buildup

Built my first Mailscanner / Postfix box on Friday due to a Sendmail meltdown last week-- was forced to throw this box into production early. 

It ran fine over the weekend, but today there's a massive queue buildup when I run an mqueue-- 10K so far and building.

Any idea where to look to sort out where it's coming from?

It's possible the box itself is overloaded, 2 2.4 ghz procs, with a load average of around 13.

Any guidance would be greatly appreciated.

Jay Chandler
Network Administrator, Chapman University
714-628-7249 / chandler at
"Bother," said Pooh as he struggled with /etc/, "it never does quite what I want.  I wish Christopher Robin was here." -- Peter Da Silva in a.s.r.

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