"I/O error on connection" problem. MailScanner related?
MailScanner at ecs.soton.ac.uk
Wed Jul 19 19:41:36 IST 2006
On Wed19 Jul 06, at 18:43, Chris W. Parker wrote:
> A user complained to me today that some of her customers are not
> receiving her emails and vice versa (she is not able to receive
> I've noticed that I get these messages in the logs at least once
> everyday from different hosts.
> I've searched and searched on this and haven't found any kind of
> concrete resolution to it. One strange thing about the posts I find on
> this are that they're generally all old. Late nineties mostly.
> Dunno if
> that means anything...
> So, could this be related to MailScanner in that MailScanner is
> too high a load on my box and therefore these errors are generated. I
> see that ClamAV and BitDefender really use a lot of cpu.
> Not really sure how to investigate this so any advice would be much
The "uptime" load averages (also printed by "top") are a vague
indication of system load, but don't worry if these are much greater
than 1. If they are less than 1 then your system definitely isn't
loaded. Check your sendmail settings in /etc/mail/sendmail.cf. Look
for QueueLA and other load averages limits (which all contain LA in
their name). It's usually worth increasing them as MailScanner can
push the load average up to 15 quite easily when fully loaded and
working nicely. So don't start refusing messages until the load
average is really quite high.
The virus scanners should only use CPU very briefly, they usually
aren't significant at all in the load of MailScanner. Try switching
off the biggies such as SpamAssassin and see how it speeds up.
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