topic Re: Mail filters in Operating System - Linux

Mail filters

Samuel Martinez — Thu, 11 Jul 2002 13:27:59 GMT

I have a Sendmail 8.11.6/8.11.6 server under linux 7.2
I have a spam contron with the /etc/mail/access file
is there any way to filter e-mails on the subject, attachements, or sise?

Help plz!

rgds:
Samuel M&M

Re: Mail filters

benoit Bruckert — Fri, 12 Jul 2002 07:50:35 GMT

Hi Samuel,
For size limitation, you have some features in sendmail to control it.
About subjects, you have some tools which can control such things (spamassasin for example which control also content and allow destruction of mail with specific words (How to win $10000 for example).
About attachment, the milter interface with sendmail can do something.
On my side, I'm using AMavis : A MAil VIrus Scanner, which consist of scanning attachment with antivirus software in order detect virus, and then stop propagation.
www.amavis.org,
But you have also other easiest tools to use which can only reject files with vbs extension or anaything else....
hth
Benoit

Re: Mail filters

Steven Mertens — Fri, 12 Jul 2002 12:28:46 GMT

Hi,

You could also try to work with procmail.
Procmail can be used as a general purpose
mailfilter and can be combined with sendmail.

see man procmail & man procmailex for some
usefull examples.

If you do a search on google you will find
a lot of examples related to procmail.

Steven

Re: Mail filters

Anu Mathew — Fri, 12 Jul 2002 13:23:43 GMT

Hi Samuel,

Hit for detailed info on procmail. (The Man pages appeared a bit cryptic to me. )

Procmail is the best way to attain your mail-control objectives.

http://www.ling.helsinki.fi/users/reriksso/procmail/mini-faq.html

http://www.uwasa.fi/~ts/info/proctips.html

http://www.procmail.org

These three links helped me a lot for reaching a solution.

Notes:

Since you use sendmail, following tips may be helpfull.

1) Create a link to procmail executable in /etc/smrsh.

2) You won't need any IFS in your .procmail as Sendmail hates it.

Hope this helps,

Thanks

Anu Mathew

Re: Mail filters

Anu Mathew — Fri, 12 Jul 2002 13:31:53 GMT

Hi Samuel,

Correction:

IFS is not required in .forward file, as it will err.

For instance, my .forward file looks like:

"| /etc/smrsh/procmail -f- || exit 75 #mattha"

Where mattha is my user-name.

hope this helps,

See http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x50bc3a7b3682d611abdb0090277a778c,00.html

for a similar posting.

Thanks

Anu Mathew