Spam and virus filter for mailserver

[Alin-Adrian Anton]

Daniela wrote:

>Hi!
>
>We have the following situation and don't know what to do:
>
>I have one POP3 account with alias adresses for the network clients, and every 
>client configured the mailer not to get mail destined for the other clients.
>Now we get so much spam and viruses, and I decided to set up a mail server, 
>recieve the mail for all the clients, and the clients get their mail from my 
>mail server, keeping their current mail adresses.
>
>The clients run M$ Winblows eXPensive, so I need an antivirus program that 
>runs on FreeBSD (should be free). Can anyone recommend a good mail reader 
>that can fetch mail as a daemon, stores mail in a format readable by KMail or 
>Evolution, and has a console interface (I don't run X often)? It should also 
>be somehow able to put the mail in different folders based on the value of 
>some headers.
>
>And what mail server should I use? It should be secure and not use up many 
>resources (security has the highest priority).
>
>Is this stuff possible at all? Please help us.
>Thanks in advance.
>
>Daniela
>
>
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>
>  
>
I think qmail is the most suitable mail server. I think and many others 
do, that it's the most secure and resource-saver mail server out there. 
And it's free, of course, you'll find it in the ports.

Qmail-scanner is a virus scanner for qmail, but I do not recommend it, 
concerning resources and security. The most lightweight filtering system 
for qmail which comes to my mind seems to be qmail-qfilter (a small C 
proggie), google for it and use it. See the sample scripts, one of them 
filters any executable attachment, like .vbs,.etc... Add .scr, .pif and 
.bat to them ;).

I use it and my 'new' qmail-queue file looks like this now (read the 
docs, it is a script, hackish):
---------------------------------
#!/bin/sh
exec /var/qmail/bin/qmail-qfilter /var/qmail/bin/filter1 -- 
/var/qmail/bin/qmail-inject -n
---------------------------------

Where filter1 is a script which filters mail using the header details.

PS: parse the headers carefully ;)
Alin.


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