After our switch from sendmail to postfix on our perimeter relay server,
we received an odd complaint from a user who was suddenly receiving two
copies of particular email messages.

It boils down to a forward file like this on one system:

  \user1company.com, user2host.company.com

The backslash in '\user1company.com' was preserved by our previous
sendmail-based relay, so that when it was finally delivered to our mail
server, it inhibited .forward file process. However, postfix strips off
the backslash, which suddenly made relevant a .forward that looks like:

  \user1, userhost.company.com

Obviously the real problem here is the .forward file setup. However, the
different behavior of postfix and sendmail took us a bit to track down.
It seems that postfix is doing the "right" thing -- I'm not sure that I
*want* external mail to shut off .forward processing -- but I figured
other folks might run into the same problem.

-- Lars

-- 
Lars Kellogg-Stedman <larslarsshack.org>

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