Suggestions / Gotchas - Linux as mail proxy to MS Exchange

From: Adam (abyram_at_ia.ua.edu)
Date: 08/23/03 

Date: 22 Aug 2003 15:18:24 -0700

The company I work for is looking into setting up a Linux proxy that
will sit between the internet (incoming mail to the domain) and our MS
exchange server. We need the Linux box to do the following:

1.) Filter spam with a reasonably good spam filter. By filter I mean
something to the effect of mail that is almost certainly spam can be
deleted and mail that has a 50/50 chance of being spam may be marked
as possible spam but passed on to the exchange server.

2.) Filter e-mails with attachments. We would like to be able to
specify that e-mails that have an attachment with an .XXX extension be
deleted. (My department head is thinking we just want to delete the
entire message, but realistically removing the attachment may suffice
once he thinks it through.)

3.) Scan e-mails for viruses and clean as necessary.

After mail passes through all 3 of the above stages, it would be
forwarded over to the exchange server and all would be good. :)

Now, what I am hoping someone here can tell me is:

1.) What programs are suggested for the tasks we need as outlined
above?

2.) If anyone has already done this or has looked into it very deeply,
do you have any suggestions of what the best way to go about this is
and are there any gotchas we should be on the look out for?

Thanks in advance to anyone that can help!

- Adam Byram

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