[cobalt-users] Mailing List Not working for domain

["Cobalt" <cobalt@xxxxxxxxxxxx>]

Hello,

I would check the archives but it seems that it is down...with that said,
here is my question.

I have a domain that the mailing list is not work.  It returns an
undeliverable message that states the address is not valid.  I have mailing
lists working correctly for several other domains.  I have tried renaming,
deleting and re-entering, sending to @www.domain.com...all with no luck.
Other email accounts work correctly on the domain.  Everything seems to be
setup correctly...just the list is having trouble.

Can someone provide some assistance as to where I should be looking for the
problem?

Thanks,
Scott