Strange Distribution list problem

J

Jaime Klein

Hello,

One of the users at my work has a strange problem with
one of their distribution lists. When he sends a mail to
that list, he gets a reply saying that it's undeliverable
and the reason was that there was "no transport provider
available". He gets this reply for all 15 people on his
distribution list. When he sends to them individually
however, it all works fine. I've checked the emails they
are all just standard addresses, our email server is
working fine, because he can send other mail. He even has
4 other distribution lists similiar to this problematic
one, that also work fine! I've run out of ideas as to
what could be the problem.

Please can someone provide some suggestions as to how to
get around this strange problem.
 
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