> Can somebody suggest me whether i can block outgoing
> mail attachements from my internel lan to outside
> world(like hotmail/yahoo...) by ipchains on linux.
> system  is working as router/proxy/firewall.

IPchains can not do this, it only examines IP packet headers, not
their contents.

My email sanitizer can do this:  http://mailtools.anomy.net/

The only catch is that the sanitizer is still in development (it works
pretty well, AFAIK, but has some RFC compliance issues which need to
be fixed), and I haven't documented it well enough.  I use it to scan
all my mail though, and haven't had any serious problems yet.

One of the undocumented things are how to use the sanitizer to do
in-transit filtering - but it is possible, for example by adapting the
Inflex sendmail configuration to use the Anomy sanitizer instead of
Inflex.

<plug>

If anyone wants to support the sanitizer project, express gratitude,
or are willing to pay for better documentation please visit:

   http://www.cosource.com/cgi-bin/cos.pl/wish/info/333

</plug>

-- 
Bjarni R. Einarsson                           PGP: 02764305, B7A3AB89
 [EMAIL PROTECTED]               -><-            http://bre.klaki.net/

Netverjar gegn ruslp�sti: http://www.netverjar.is/baratta/ruslpostur/
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