[TriLUG] Spam help

Jon Carnes jonc at nc.rr.com
Sat Sep 7 16:27:26 EDT 2002


Look at the Mail Scanner thread from last week!

Mail Scanner lets you run Spam Assassin and a virus scanner (linux based
of course) on all your inbound mail before it reaches your Exchange
server.  The best part about Mail Scanner in your case, is that
front-ending Exchange is one of the primary examples of use!

Here's the quick 1-2-3:

 1) install Linux as a mail server on a decent box with lots of RAM. 
Sendmail will work just fine as the MTA.  For about 8k/messages a day
with normal distribution throughout the day (a double-spiked bell
curve), I found that you need from 512Mb to 768Mb of RAM.

 2) Test the new mail server and set it up so that it passes all mail to
your Exchange server by default.

 3) Install Spam Assassin on the Linux server (again see the thread on
Mail Scanner from last week - or the thread on SpamAssassin from two
months ago).  Set it up to run as a Daemon.

 4) Install Mail Scanner and tell it to use Spam Assassin.  If you have
a corporate Virus Scanner license, then down load the Linux virus
scanner and install that first to the server.

 5) Test. Test. Test.  Send a bunch of mail through that server and see
what happens to it.  Even toss a virus through it!

 6) Now that the new server is working and SpamAssassin is filtering the
mail on the new mailserver  - modify your DNS to set it as the primary
for external folks using your mailserver.

*OR* set the new Linux mail server as the secondary and restrict access
to your Exchange server's port 25 so that only local access is allowed. 
Remote mail servers won't be able to drop off to your Exchange server
and instead they will drop off mail to your new Secondary, which will
then scan the mail, before forwarding the mail onto the Exchange server.
===

Let me know if you need any help!  And thanks for doing your part to
stamp out Spam!


Jon
======
On Sat, 2002-09-07 at 15:48, Chris Knowles wrote:
> As usual, I come to you in a moment of need.
> 
> I'm tired of getting spam at work.  (At home I use SpamAssassin.)
> 
> The problem being that....
> 
> 1) we use Exchange server, and can't move off of it yet.
> 2) we have no money to spend.
> 
> So I have been looking around, and there are some tantalizing hints
> about using a Linux post to filter e-mail on it's way to the Exchange
> server.
> 
> Unfortunately, I need more than a few hints.  Can anyone give me some
> direction on doing this?  Web links, books, and descriptions are all
> appreciated.
> 
> I prefer postfix, but with more direction, I can probably figure out
> sendmail.
> 
> Thanks in advance.
> 
> CJK
> 
> 
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