Earlier, Jon Lewis said:
----- The following addresses had permanent fatal errors -----
<abuse@uu.net>----- Transcript of session follows -----
... while talking to mail.uu.net.:
>>> RCPT To:<abuse@uu.net>
<<< 550 <abuse@uu.net>... User unknown
550 <abuse@uu.net>... User unknown
Connected to mail.uu.net.
Escape character is '^]'.
220 relay1.UU.NET ESMTP
vrfy fsdf
550 fsdf... User unknown
vrfy abuse
250 <abuse@relay1.UU.NET>
quit
221 relay1.UU.NET closing connection