20 Mar
2001
20 Mar
'01
4:45 a.m.
On Sun, 18 Mar 2001 12:12:24 -0500 Barry A Warsaw <barry@digicool.com> wrote:
Mailman kills loops by adding an X-BeenThere: header with the list address as the value. If it detects such a header on an incoming message, it throws a LoopError, which is currently defined to discard the message. Not all mail loops will preserve X-BeenThere, but I think in practice it works pretty well.
Note that many MTAs also have their own loop detection. Postfix for instance hooks off Delivered-To:.
-- J C Lawrence claw@kanga.nu ---------(*) http://www.kanga.nu/~claw/ --=| A man is as sane as he is dangerous to his environment |=--