Hi Lisa,

> I would like to perform spam and virus filtering using a combination
> of Mailscanner, Spamassassin and ClamAV.
>
> I had originally intended building a scanning gateway, but having read
> the archives here I don't think this is a good idea.

In my opinion if you have a very high volume of messages it is a good way to 
go. You could for example centralise your user database and use LDAP to 
connect the various components of your email "cluster." This way you can 
distribute the load across as many servers as you need and with courier it is 
very easy to implement as the LDAP support in courier is *excellent*.

So if you do have a very high volume of emails do consider building a scanning 
gateway.

> Looking for ways to integrate Mailscanner, I came across this link for
> using maildrop for the handoff:
> http://www.crazysquirrel.com/computing/debian/courier-spam.jspx

I have had a quick look at this link, there is nothing about mailscanner 
there. Either mail scanner or amavis have a module for courierfilter if I am 
not mistaken. I have seen it somewhere but I don't recall where as I didn't 
try to use it.

> The maildroprc given here doesn't make any sense to me at all.

What doesn't make sense there? The way he calls spamassassin seems pretty 
normal to me. You can use xfilter to call an external program and then you 
can do further processing on the message based on the score. I put the 
messages with score higher than 6.5 in a folder called spam. Messages on this 
folder expire in fifteen days.

> Can anyone here tell me if this is the correct approach. My goals are:
>
> 1) Perform spam detection on a different machine for scalability /
> performance issues

For scalability I would use multiple machines as I said at the beginning of 
this email.

> 2) Archive spam on the other machine for release
> 3) Automatically return what is determined to be ham back to courier.

You can use DSPAM to do what you want as well, it is pretty good. I am 
implementing it at the moment, it has quarantine.

> Is there documentation that someone could point me to for this, or a
> setup that I can research. I'm getting nowhere with google apart from
> the above link but its more like a recipe that I won't understand than
> a documented approach.

If you read Courier's documentation and DSPAM's and learn LDAP if you haven't 
yet you will get enough background to do what you want.

Let me know if you have any questions.

Regards,
Vini

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