[Mailman-Users] Mailman traffic bouncing with "User Unknown"

Mark Sapiro msapiro at value.net
Thu Oct 28 17:40:49 CEST 2004

Bob Richards wrote:
>I am running Mailman 2.1.5, and all has been perfect for some time now.
>One of our list members just moved to a new ISP, so we changed his 
>address. Now all list traffic to him bounces
>with "user Unknown" errors. His ISP is using EXIM. I can send him email, 
>he can reply, I can even send him
>BCC mail with priority:List set and it arrives OK. ONLY Mailman traffic 
>addressed to the very same address bounces.
>Anyone seen this? Anyone resolved this? Any Ideas??

What is the "unknown" address reported in the bounce message?

Possibly his address on the list contains a transparent control
character. If you click his address in the membership list to go to
his options page, does the resoltant URL have any %xx characters in it?

Mark Sapiro <msapiro at value.net>       The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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