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Qmail / SpamControl => Check if DNS exist ?
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Phibee NOC
*nix forums beginner


Joined: 22 Mar 2005
Posts: 31

PostPosted: Thu Jul 20, 2006 4:51 am    Post subject: Qmail / SpamControl => Check if DNS exist ? Reply with quote
Hi

i receive a big quantity of mails from a "domain generator" :

dsjfklsdjflksjdf.com
kjdflsk.com

can i said to my qmail that see on the DNS if the domain are
created, and if no, reject email ?

thanks
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Kyle Wheeler
*nix forums Guru Wannabe


Joined: 07 Jan 2005
Posts: 208

PostPosted: Thu Jul 20, 2006 5:39 am    Post subject: Re: Qmail / SpamControl => Check if DNS exist ? Reply with quote
On Thursday, July 20 at 06:51 AM, quoth Noc Phibee:
Quote:
can i said to my qmail that see on the DNS if the domain are
created, and if no, reject email ?

Presuming that your qmail is set up similar to the Life With Qmail
document describes, one easy way would be to use a script to wrap
around it (i.e. use it like rblsmtpd). You’ll want to give tcpserver
the -h flag to make this work. Such a script might look like this:

#!/bin/sh
if test -z "$TCPREMOTEHOST" ; then
echo 421 try again when you have DNS working.
echo blocked connection from $TCPREMOTEIP >&2
exit
fi
shift
exec "$@"

~Kyle
--
Morality, like art, means drawing a line someplace.
-- Oscar Wilde
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Charles Cazabon
*nix forums Guru


Joined: 08 Jan 2005
Posts: 805

PostPosted: Thu Jul 20, 2006 2:28 pm    Post subject: Re: Qmail / SpamControl => Check if DNS exist ? Reply with quote
Noc Phibee <noc@phibee.net> wrote:
Quote:

i receive a big quantity of mails from a "domain generator" :

dsjfklsdjflksjdf.com
kjdflsk.com

can i said to my qmail that see on the DNS if the domain are
created, and if no, reject email ?

Yes. See qmail.org for a patch by Nagy Balazs that refuses mail if the
envelope sender domain isn't valid.

Charles
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Charles Cazabon <qmail@discworld.dyndns.org>
Read http://pyropus.ca/personal/writings/12-steps-to-qmail-list-bliss.html
My services include qmail consulting. See http://pyropus.ca/ for details.
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