Spamassassin is slow - any tips or good commercial alternative?

[Martin.Hepworth]

Charlie

Reject non-valid email recipients on the incoming MTA.

If you're growing at that rate I suggest you get a couple of machines to round robin DNS load share the mailscanner job, then if one goes pop the other will be to carry on.

--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300

> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info
> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf
> Of Charlie
> Sent: 19 June 2008 01:41
> To: MailScanner discussion
> Subject: Spamassassin is slow - any tips or good commercial
> alternative?
>
>
> >> The concern is that I am eventually looking to have over 10,000
> >> users, so will be receiving, and then sending, multiple emails per
> >> second.
> >> Even now, with only 1,500 users, people have started reporting "Too
> > many concurrent SMTP connections; Please try again later"
>
> >I manage a mail cluster for an ISP that has about 100,000
> subscribers
> >online at any given time.  I'd hazard a guess that close to all of
> >those subscribers have a mail client running the whole time.
>  We have
> >implemented an exim set up that allows 3 concurrent connections from
> >the subscriber IP pools, 5 from from other IP's and a
> maximum number of
> >simultaneous SMTP sessions of 1000 per server.  This is on
> each server
> >in the cluster (4 servers in total) and we only ever see the maximum
> >concurrent per IP rules being hit, never the maximum total.
>
> >As you didn't mention which MTA you're using, I can't give config
> >examples, but make sure you pay close attention to the
> default max-per-
> >IP and max-total SMTP session limits.  If these are still
> the defaults,
> >they are probably far too restrictive for a multi-thousand user mail
> >hub.  Also, if you're not already, put some thought into connection
> >mitigation techniques such as RBL's, grey listing, etc.
> >These will have a dramatic effect on external sites chewing
> up all your
> >SMTP connections.  Also if your users are the sort of people who sit
> >there smashing the "send and receive" button in their mail
> client, you
> >may also want to think about rate-limiting connections from
> any single
> >IP...be careful if you implement this, you can DoS your users if it
> >isn't done right!!
>
> Thank you James - this will be very helpful I suspect.
> We also are using Exim as the MTA, so any specific config
> advice for Exim would also be greatly appreciated :) BTW we
> are using one server (Pentium 4, 2.4GHz, 1GB RAM), currently
> have 1500 active paid users,  and am expecting up to
> 10,000-15,000 active paid users in the future (say,
> 1 or 2 years from now).
>
>
> --
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> http://lists.mailscanner.info/mailman/listinfo/mailscanner
>
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>
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>




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