[Mailman-Users] non-subscriber managed to post to a subscriberonlylist

Mark Sapiro mark at msapiro.net
Mon Jan 26 23:16:02 CET 2009

Grant Taylor wrote:

>On 01/26/09 15:26, Mark Sapiro wrote:
>> All the headers of the spam post. In a default installation, if any 
>> of From:, Reply-To: or Sender: headers or the envelope sender as 
>> reflected in the Unix From or Return-Path: header contains a member 
>> address, the post will be deemed from that member.
>Can this behavior be disabled?  IMHO trusting the purported From: / 
>Reply-To: / Sender: / From / Return-Path: headers is a fairly (being 
>nice) "less than wise" thing to do.

You can change/limit which headers are used. See SENDER_HEADERS in
Defaults.py, but as has been pointed out, in most cases, you want to
look at something to determine if a post is from a list member.

If you're suggesting there should be further authentication of the
purported sender, that would be a more difficult implementation and
possibly more burdonsome than you would want for legitimate posters.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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