Mailscanner performance monitoring ?

Martin Hepworth maxsec at
Wed May 1 16:35:17 IST 2013

local caching DNS server
only run a couple of RBL's (no need to run lots)
drop unknown recipients on the incoming MTA

Martin Hepworth, CISSP
Oxford, UK

On 1 May 2013 15:31, Arjan Melein <Amelein at> wrote:

> We're currently getting flooded by spam and every so often our mailscanner
> is having trouble seems to have trouble keeping up causing our inbound
> queue to hit 3000+ messages and I am trying to figure out where the
> processing time is going.
> I am getting the impression *something* is causing a delay, I am unsure as
> to what but I'm thinking in the way of RBL's or DNS...
> The server is a quadcore with 20 MS threads and it can churn through 10-30
> average mails per second depending on their size so either e-mails are
> being delivered faster then they can be scanned or there is indeed a delay
> somewhere.
> Its a 'new' install (few months old) on FC18. I've seen it clear the 3000
> message queue in 5 - 10 minutes after manually stopping and starting
> mailscanner.
> Any ideas anyone ?
> -
> Arjan
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