Email list subscription failure

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Email list subscription failure

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Hello --

I've registered a username and email address to the CAS Developer/User forum. When attempting to post a message to the forum, I was prompted to also subscribe to an email list. When I selected the option the subscription request was sent after which I received the following subscription request failure response:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
    SMTP error from remote mail server after RCPT TO:<>:
    host []:
    550 5.1.1 unknown or illegal alias <>:

Any help in resolving this error condition would be appreciated. If I should be posting this to another forum or topic, please let me know.

Thanks for you help.