MailScanner slowwing down

Fri May 1 12:53:29 IST 2009

I've managed to reduce the load (fingers crossed), I cant get smf-sav to
compile on my box yet, but still looking into it.

I firewalled some brazil IP Ranges which took a good load off too.

Seen some bogus recipient addresses that are really targeted to and rejected
them in my access database.

I'm going to try my utmost to get smf-sav working  - would love a sample of
someones conf file where they have multiple domains multiple exchange
servers for recipient verification

From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of G. Armour
Van Horn
Sent: 30 April 2009 22:00
To: MailScanner discussion
Subject: Re: MailScanner slowwing down

I was looking at those yesterday because I was running the load average up
to 10 or 12 in spurts. My box has a Sempron 2200 and a gig of RAM, so it
does swap when it gets busy. I can upgrade to a machine that's half again
faster with twice the memory for the same monthly fee, but I'd have to run
both during the transition and it would take a ton of time to move
everything over. (It's a webserver for a couple of dozen domains and my
secondary name server.)

I told Sendmail to stop accepting connections at load average of 6, which
kept the load average from trying to get to 50. (Yes, I have seen the la go
that high, although not on this system. It ain't pretty!)

I dropped the child count from five to three, which seemed to help - each
child just took bigger bites and the throughput didn't seem to be affected.

One thing that looked appealing was setting up a caching nameserver, but all
the docs I ran into assumed that you weren't already running BIND on the box
and that you wanted to cache your local network, so I was too confused to
get that running. (I do have everything installed, just need to figure out
the config.)

I did add pause-greet to the Sendmail config, it blocked at least a hundred
messages overnight. Not a big change, but the price is right.

I'm thinking about setting up greylisting, it will cut down on the MS load
and should spread out the surges a little.

I guess I should have expected things to slow down when I leapfrogged so
many versions on Tuesday. Now I've got to figure out how to get it back in
control or bite the bullet and get some more horsepower.

Van

Martin Hepworth wrote: 

See 

http://wiki.mailscanner.info/doku.php?id=maq:index#optimization_tips

and

http://wiki.mailscanner.info/doku.php?id=maq:index#getting_the_best_out_of_s
pamassassin

Dropping unknown recipients and having a local caching nameserver are
generally the first things to sort, then look at the number of children and
batch size...

-- 
Martin Hepworth
Oxford, UK

2009/4/30 Mail Admin <mailadmin at midland-ics.ie>

Hi All,

Recently I am finding that the amount of incoming mail through my
MailScanner Server  is really slowing down things.  There is a heavy load
now since I took on a domain that seems to me well spammed. Yesterdays
processing processed 22,000 emails @88% Spam approx.

Server Spec POWEREDGE 1850 XEON 2.8GHZ/2MB 800FSB - WITH 2 GIG RAM and RAID
1  Configuration on two Disks RPM 10K. Its Running Fedora Core 5, Send Mail
8.13.8-1.fc5 with MailScanner 4.69.7-1 with SA, Razor, DCC., MailWatch V1

Its working very well blocking spam, but only in the last couple of days its
got really slow. 

Any ideas on how to reduce the load on this server>? By blocking mail at the
MTA before it hits MS? OR Tweaking my processes?

What do the Experts think on the Server Spec, for the amount of traffic?

I'd appreciate any help

Regards

Kevin

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