I've previously reported an interaction between SIMS and "MessageWall"
software. In that case, the other mail agent was responding with an
inappropriate 452 error, and SIMS was handling it badly.
New case: two of three newly installed mail servers at ithaca.edu
(spamtrap.ithaca.edu, and webapps.ithaca.edu) are returning a
450 error instead of a 550 when a mailbox cannot be found.
The third mail server (icmail.ithaca.edu) reports a 550 for the
same address.
Here's a sample from the diagnostic at www.dnsreport.com:
webapps.ithaca.edu's postmaster response:
>>> RCPT TO: <[EMAIL PROTECTED]>
<<< 450 4.7.1 ... Could not stream address
The issue isn't the fact that there is no postmaster address,
but the 450 response.
SIMS, bless its heart, aborts the entire transaction, as it does
with the 452. It reports the same 450 error for the other recipients
in the delivery list at that domain, even though they would deliver
properly if not connected to the non-existent address that gets the 450.
Furthermore, the aborted delivery does *NOT* count against the
counter of delivery attempts... (in my case, that's 100 attempts,
and the message looped in the queue for about two weeks (every
half hour, about 700 attempts) before I manually killed it.
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