I see about 250,000 messages per day and I have 3000 accounts.
> 3.05ghz xeon with 1gb of RAM
I thought it would be worth making a few comments here. The two most
likely culprits are either CPU usage or processing time per message.
Typically, when using anti-virus, it is recommended to have at least
1GHz of CPU power for every 100,000 E-mails/day that a server handles.
So in this case, you have just a bit more than the minimum recommended
amount of CPU. The first thing to do is check your CPU usage when you
have Declude running; if it is at 100%, you've found the main issue. If
that is the case, following the suggestion of switching to F-Prot would
be a good option, and checking to see if you are using CPU-intensive
Declude JunkMail filters would be a good idea.
The second is that at 250,000 E-mails/day, you are close (in the same
order of magnitude, at least) to the maximum amount of E-mail that an
IMail server can comfortably handle. At that volume, each E-mail
normally has about 10 seconds to be scanned and delivered. Exceed that,
and E-mail will get backed up until the rate goes back under that ~10
second threshold. If you never go below that threshold, you will never
be able to deliver all your E-mail (it's kind of like eating more
calories than you burn every day -- you'll keep gaining weight forever
until you burn more calories or eat less calories).
If the issue is processing time, one option is to either add another
IMail server to help balance the load, or have one or more gateways
(IMail, IMGate, or something else) process the E-mail first. Another
option is to reduce the amount of time spent processing each E-mail --
unless there is a configuration issue, Declude Virus should take <1
second to scan each E-mail, so tuning the Declude JunkMail settings
would be good here (weeding out any spam databases or other lookups that
are no longer responding, or slow to respond).
-Scott
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