Imail - slow server - mail delivery problems.

My installation:
Imail 8.03HF1
300 Local Users
P3-800  with 1gb memory on an NT4.0 server.
Declude Anti-Virus (MacAfee)
Declude Spam block
I am also using Imail Spam blocking
Internet connection is a dedicated T1
100 baseT Ethernet internal network


I am blocking the following attachments:
exe,com,bat,pif,txt,scr,jpg,gif,tif,bmp,mp3,mov,avi

Usage:  These are a weekly average
SpamContent             433
SpamPhrase              69
LocalDeliver    7338
RemoteDeliver   2722
SpamFeatures    3
SpamUrlDomain   1009

I also average 500 blocked attachments /day and 400 virus notifications /day

I am sending virus and ban notify notifications to %MAILFROM%;%ALLRECIPS%

Problems:
I am having problems with the spool directory filling up with files.  I have
to clean out 150+ unsent messages a day
I am having delays of 60+ minutes when my spool directory is full of unsent
messages.
My CPU usage spikes seems to average 5-10% but has prolonged periods (2-3
minutes) of 70+%


Local messages are now taking 15-20 minutes to process.
Web Mail pages take 5-7 minutes to load 10 messages at a time.

My questions:
Am I slowing down my server with the notifications and scanning for
attachments?
What is the best way to handle blocking attachments and notifying users?
Is there a way to quarantine the blocked attachment for later retrieval?

Thanks
Patrick McHenry




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