>>> What's happening is if someone replys to all to a post to
>>> hosta.dom.ain (the original name), both names (list@???,
>>> list@???) appear in the to:/cc: headers, and duplicate
>>> messages are received.
>
>> Where is the second version of the list's address coming from? Is
>> Mailman adding it or is Exim? Perhaps the logs from the delivery of a
>> message to the list will be enlightening.
>
> The users MUA. The reply-to: was set to the list, Reply-To-All was going to
> Both the old and the new names.
Where was the MUA getting the second address from? Something was clearly
adding the list's alias to the headers of the message that the user was
replying to. You need to stop that happening.
Tony.
--
<fanf@???> <dot@???>
http://dotat.at/ ${sg{\N${sg{\
N\}{([^N]*)(.)(.)(.*)}{\$1\$3\$2\$1\$3\n\$2\$3\$4\$3\n\$3\$2\$4}}\
\N}{([^N]*)(.)(.)(.*)}{\$1\$3\$2\$1\$3\n\$2\$3\$4\$3\n\$3\$2\$4}}