Problematic Email address found!

There is a problem with the email address supplied by our member.
He or she gave us n_a_kostov@usa.net
but on 2004-11-03 21:12:06 our mailserver got an error 550: User not known).
If you see what is wrong, please send me a note with the form below.
Thanks,
Werner (Chaos-Group-Postmaster)

Just checking: What year is now?
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