How do I block a domain from the recieved portion of headers

[Stephen Swaney]

> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-
> bounces at lists.mailscanner.info] On Behalf Of Brandon Hoppe
> Sent: Wednesday, March 22, 2006 12:10 PM
> To: 'MailScanner discussion'
> Subject: RE: How do I block a domain from the recieved portion of headers
> 
>  I'm using sendmail on Solaris 9.
> 
> I like the way you mention better. I'll have to see if sendmail has such a
> rule. 
> 
> What MTA are you using. I'm using PostFix and have a check_helo_access
> rule that rejects email falsely claiming to be from within my domain.
> 
> The ol reply to myself problem. Forgot that I also have a
> check_sender_access with smtpd_helo_restrictions.
>  

Look at adding bogus HELO checking to sendmail. Download:

http://www.cs.niu.edu/~rickert/cf/hack/block_bad_helo.m4

Install the contents as /usr/share/sendmail-cf/hack/block_bad_helo.m4

Then add the line below line to the top of your sendmail.mc file right after
the line "include(`/usr/share/sendmail-cf/m4/cf.m4')dnl":

Here is the line to add:

include(`/usr/share/sendmail-cf/hack/block_bad_helo.m4')dnl:

The rebuild your sendmail.cf file:

	m4 sendmail.mc > sendmail.cf

Then restart MailScanner.

Steve

Stephen Swaney
Fort Systems Ltd.
stephen.swaney at fsl.com
www.fsl.com