[K12OSN] Mail Server

Rick O'Dell rodell at bakersfield.k12.mo.us
Thu Jul 22 21:28:54 UTC 2004


	I ran top, Of course, I'm not having  a problem at the moment. I didn't see
anything that looked excessive. MailScanner is using about 1.6% of memory is
use.


Rick O'Dell
Net Work Administrator
Bakersfield R4 School Dst.
Phone (417)284-7333 ext 303
rodell at bakersfield.k12.mo.us



-----Original Message-----
From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com]On Behalf
Of Eric Harrison
Sent: Thursday, July 22, 2004 3:52 PM
To: Support list for opensource software in schools.
Subject: Re: [K12OSN] Mail Server


On Thu, 2004-07-22 at 13:30, Rick O'Dell wrote:
> 	Hi all, I am having Mail Server problems. I installed k12ltsp 4.01,
> Postfix, MailScanner, Spamassin, ClamAV. The Box Is AMD 1100Mgz with one
Gig
> of Ram. All worked well for a couple of weeks, yesterday it locked up,
check
> of log files shows "Mail Kernel: Out of memory Killed process 11999
> (MailScanner)". Can anyone tell me what's going on, and what can I do to
fix
> it????
>

Looks like you have a run-away process that is using up all of your memory.

MailScanner or ClamAV is the most likely culprit. As another poster pointed
out, you can run "top" and watch for guilty party.

I've heard tails of malicious emails/virus that "zip-bombs" mail servers.
If you make a huge file containing all zeros, for example, it will compress
down to a really small size. You can make a zip bomb my recursively
including
zipped copies of such a file. Attach the final zip file to an email and the
victim's mail server may run out of memory trying to unzip the zip-bomb.

Something to look out for in your mail spool...

-Eric

--
Incoming mail is certified Virus Free.
Checked by AVG Anti-Virus (http://www.grisoft.com).
Version: 7.0.253 / Virus Database: 263.4.7 - Release Date: 7/19/2004

--
Outgoing mail is certified Virus Free.
Checked by AVG Anti-Virus (http://www.grisoft.com).
Version: 7.0.253 / Virus Database: 263.4.7 - Release Date: 7/19/2004





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