[Mailman-Developers] Re: [Mailman-Users] Getting caught by SPAM Filters because of Mailman handoff

[Richard Barrett]

On 24 Apr 2004, at 02:10, Lloyd F. Tennison wrote:

> Companies are now starting to block Mailman lists (among others)
> because of the way the headers are sent out stating the hand-off to
> the server:
>
> Received: from localhost.localdomain ([127.0.0.1]
> helo=mail.python.org)
> 	by mail.python.org with esmtp (Exim 4.22)
> 	id 1BH7Kx-0001vz-7S; Fri, 23 Apr 2004 16:31:51
> -0400
>
>
> Anything with that format - they are marking as "probable SPAM"
>
> Any thoughts on how to zap?
>

Although I run the outgoing MTA and Mailman on the same machine, my 
Mailman SMTP configuration tells it not to address the MTA using 
localhost (127.0.0.1) but by the FQDN and IP number which appears in 
our globally published MX record for that server. Thus the Received: 
header added by the outbound MTA at this juncture refers to reception 
form a host (itself) which is resolvable via DNS to an MX record by 
MTAs which subsequently handle the message. In that respect, it is thus 
fairly indistinguishable from other Received: headers that precede and 
follow it.

Would this be avoid triggering the approach in anti-spam measures you 
refer to?

> Also, as I mine is an announce only list - it would be nice to be able
> to zap the other received from headers and show the message as
> coming directly from the server. One webmail program does it - but
> it cannot send HTML.
>
> Received: from localhost.localdomain ([127.0.0.1]
> helo=mail.python.org)
> 	by mail.python.org with esmtp (Exim 4.22)
> 	id 1BH7Kx-0001vz-7S; Fri, 23 Apr 2004 16:31:51
> -0400
> Received: from mydomain.com ([111.111.11.111])
> 	by mail.python.org with esmtp (Exim 4.22) id
> 1BH7Ko-0001tP-Ph
> 	for mailman-users at python.org; Fri, 23 Apr 2004
> 16:31:42 -0400
>
>
> BTW - usim exim as MTA.
>
>
>
> Thanks.
>
> Lloyd F. Tennison
> lloyd_tennison at whoever.com
>
> No trees were harmed in the transmission of this
> message.
> However, a rather large number of electrons were
> temporarily
> inconvenienced.