[Mailman-Users] Trouble with mailman external responses

Brad Knowles brad at shub-internet.org
Thu Mar 8 04:36:24 CET 2007

At 2:08 PM -0700 3/7/07, vancleef at lostwells.net wrote:

>  I'd really call a sendmail receiving site that blocks dynamic IP mail
>  as "misconfigured," when virtually all of the mail coming from such
>  IP's is spam.

On the python.org mail system, we do not accept e-mail from sites 
that don't have proper working reverse DNS set up for their IP 

However, we do not refuse connections from networks that are known to 
be within dynamic IP address space from major providers -- some of 
our own key people (like Barry) use dynamic IP address space, and we 
wouldn't want to reject their connections or connections from anyone 
else doing the same.

So long as those addresses have proper reverse DNS set up for them, 
and they're not on one of the very conservative RBLs that we use, 
then they should be fine.  IMO, this is a reasonable balance to 

Most everything else we do is done within SpamBayes, which is a 
Bayesian anti-spam classification system written in Python, and 
maintained by various well-known people in the Python community (see 
<http://sourceforge.net/projects/spambayes> and 

In this respect, we eat our own dog food, and run the same anti-spam 
processing system on our own machines as we provide for the benefit 
of the larger anti-spam community.

Brad Knowles <brad at shub-internet.org>, Consultant & Author
LinkedIn Profile: <http://tinyurl.com/y8kpxu>
Slides from Invited Talks: <http://tinyurl.com/tj6q4>

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