Did you use Reply or Reply Group? When you use Reply, the message is sent
directly to the individual to whom you are replying. And, as I have
learned, some of the folks use a ficitious email address, apparently to
avoid any spammers somehow getting their email address through the
newsgroup.

When you use Reply Group, the reply does not go to an individual; it gets
posted here where all newsgroup users can see it, and you won't get a
non-delivery notice.

"Bill" wrote in message
...
The message could not be sent because the server rejected the sender's
e-mail address. The sender's e-mail address was '.
Subject 'test', Account: 'pop.rcn.com', Server: 'smtp.rcn.com', Protocol:
SMTP, Server Response: '530 Authentication required', Port: 25,
Secure(SSL):
No, Server Error: 530, Error Number: 0x800CCC78