[cobalt-users] User not receiving email? (catchall problem?) RaQ4

["FantasticMoms.com" <admin@xxxxxxxxxxxxxxxxx>]

Hi Guys,

I have one user on my RaQ4 which seems unable to receive emails.  The user
is set as admin for their domain, and is the only user.

I have a catchall set up correctly in exactly the same manner as all my
other domains, using @www.domain.com in the email alias field.  If email is
sent to

username@domain (the exact user name) it gets through just fine

mail@domain sends but never gets delivered

abcde@domain & test@domain result in "The message could not be sent because
one of the recipients was rejected by the server. <snip domain info>
Protocol: SMTP, Server Response: '550 5.1.1 <abcde@xxxxxxxxxx>... User
unknown', Port: 25, Secure(SSL): No, Server Error: 550, Error Number:
0x800CCC79"

If I use the "forward all email to" field, still only the emails sent to the
exact user get through.  So it seems a catchall has broken.  How can I fix
this?  Could it be something broken in a user table?