[Mailman-Users] Uncaught 550 reject bounce notification

[Barry Finkel]

I have a Mailman 2.1.9 Uncaught bounce notification:

     From: <>
     To: LISTNAME-bounces at example.com
     Subject: Returned mail: unreachable recipients:gingehen at wicc.weizmann.ac.il

     The original message was received at Thu Nov  8 14:58:21 2007

     Likely reason for failure: 550 5.1.1 <gingehen at wicc.weizmann.ac.il>... User unknown

Why was this not caught as a standard 550 rejection?  Is it because the
initial mail received a 250 return code

     to=<gingehen at wicc.weizmann.ac.il>,
     relay=mail-gate2.weizmann.ac.il[132.77.4.177]:25,
     status=sent (250 Requested mail action okay, completed)

and then the mail was rejected?  But it is not the Mailman machine that
has the smart SMTP mailer; I send all Mailman mail via Postfix to
another machine for delivery.
----------------------------------------------------------------------
Barry S. Finkel
Computing and Information Systems Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-4601
Building 222, Room D209              Internet: BSFinkel at anl.gov
Argonne, IL   60439-4828             IBMMAIL:  I1004994