sendmail errors

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Author: Joel Hanger
Date:  
Subject: sendmail errors
Hello all,
    I have had sendmail set up on my linux box for some time now and haven't
had any problems... just today I had sent an e-mail out without a problem,
but tonight I went to reply to a message and it gave me this error


[Mail not sent. Sending error: 451 queuename: Cannot create "qfVAA13071]

does anyone know what could be causing this, or a way to fix it?
Thanks in advance.

Joel