[SAC] Mailman Postfix tuning - Urgent

[Alex Mandel]

http://wiki.centos.org/HowTos/postfix_restrictions

Helo and Sender restrictions might help, by validating that senders have
valid domains to start and follow standard practices.

We do have recipient restrictions enabled already.

FYI, I just tried uping the queue_run_delay to 600 from default 300. To
try resending less often.

Thanks,
Alex

On 04/18/2014 06:03 PM, Alex Mandel wrote:
> Disk rebuild on osgeo4 is taking longer than expected. Not sure why, but
> even with all the VMs off it was going at 2%/hour.
> 
> After a couple of hours I turned on Mail so that we wouldn't impact the
> mailing lists for too long. The problem here is that Mail is the biggest
> i/o user on osgeo4.
> 
> Poking around and reading up, I think there are some things that can be
> done to make Mail behave better but would really prefer someone who
> knows postfix step in and help out here.
> 
> Ideas and observations:
> Ram-disk for the queues? (Yes we can allocate more ram to the instance)
> 
> We seem to have a high deferred queue, do we need to clean out bad
> addresses? Perhaps increase the delay time, or spin off the deferred
> queue to another "graveyard" server?
> 
> Is apache being hammered by bots scanning the archives?
> 
> Are there bot like things trying to subscribe, I see some odd @wp.pl
> addresses in the apache logs, trying to hit many list in a few seconds
> and then rotating the username.
> 
> Are we using a local DNS cache?
> 
> http://www.postfix.org/QSHAPE_README.html#deferred_queue
> http://www.postfix.org/postconf.5.html#queue_run_delay
> 
> Who's up for the challenge?
> 
> Thanks,
> Alex
> 
> PS: I'll turn QGIS and Projects back on in a few hours. Hopefully this
> can be tuned before that. Adhoc will likely stay off for the weekend.
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