[Mailman-Users] Using mailman to take care of mailer-demons
J C Lawrence
claw at kanga.nu
Tue Jan 15 23:58:54 CET 2002
On Tue, 15 Jan 2002 15:18:36 -0500
Jon Carnes <jonc at haht.com> wrote:
> Some email systems send "bounces" from some weird addresses (as
> apposed to Mailer-Daemon, or some such address).
A bounce is sole identified by having a null return address in the
envelope, and by nothing else. None of the headers on a message are
significant in determining if a given message is a bounce, Not From:
not To:, none of them.
> As such, Mailman may not be able to interpret that the email is a
The problem is that Mailman attempts the parse the body of a bounce
to determine subscriber address. As the message body format is not
standardised this is an error prone process (which also explains the
attraction of VERP).
> Mailman may simply interpret the mail as a reply.
Not if it has a null return-to envelope. Guaranteed.
> There is a whole section in Mailman that is devoted to identifying
> different types of bounces. The current list includes bounces
> from: Compuserve, Exim, Groupwise, Microsoft, Netscape, Postfix,
> SMTP, Smail, Yahoo, etc...
Right. That's the message body parsing stuff, not the bounce
> But folks use a wild number of differing Mailservers (like Lotus
> Notes, Connect2, etc...). If they don't use a standard "bounce"
> format, and the bounce format they use has not been added to
> ~mailman/Mailman/Bouncers/.. then the message that comes back is
> seen as a reply from a user that is not on the list.
Nope, not unless the MTA in question grossly violates the RFCs and
uses a non-null return address.
J C Lawrence
---------(*) Satan, oscillate my metallic sonatas.
claw at kanga.nu He lived as a devil, eh?
http://www.kanga.nu/~claw/ Evil is a name of a foeman, as I live.
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