The original message was received at Thu, 26 Jun 2003 07:48:55 -0700 (PDT) from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors ----- challenge-rsa-list@rsa.com (reason: 550 5.1.1 challenge-rsa-list@rsa.com... User unknown)

----- Transcript of session follows ----- ... while talking to mail.xcert.com.:

...

...

RCPT To:challenge-rsa-list@rsa.com

<<< 550 5.1.1 challenge-rsa-list@rsa.com... User unknown 550 5.1.1 challenge-rsa-list@rsa.com... User unknown