Message duplication when local SMTP server gives 451 error

[Matthewf]

I have a list of 4 members.
1 of the member's email addresses gave a 451 response when Mailman
connected to the local SMTP server (for various reasons).

Every qrun was then sending mail to _all_ the list members (resulting in
duplicate messages), until I fixed the 451 error at which point it
stopped.

How to reproduce:

o Create a list with myself and an alias that the local smtp server gives a
"451" response to.
o Send a message to the list
o I get a copy of the message once a minute (there are 2 pairs of .db/.msg
files in the qfiles directory at this point)

Once I delete the aliase that gives "451" or allow it to be
delivered the repeated messages stop and the qfiles files are deleted.

[http://sourceforge.net/tracker/index.php?func=detail&aid=209433&group_id=103&atid=100103]

[Barry Warsaw (barry)]

Yes, this is definitely broken. Fixing it may be difficult though, so I'm
not sure when it'll happen.

[Barry Warsaw (barry)]

Fixed for 2.0beta5.