Hi- I have had Office 2007 Beta 2 installed now for about a week and have
been having no problems at all until today. I have tried to reply to messages
that I received and I immediately get a message in my box from "System
Administrator" claiming the message is undeliverable. The message in the body
of the e-mail I receive says the following:

Your message did not reach some or all of the intended recipients.

Subject: xxxxx
Sent: 6/6/2006 8:51 PM

The following recipient(s) cannot be reached:

'David Xxxxxxx' on 6/6/2006 8:51 PM
550 5.7.1 ... Relaying denied. Proper
authentication required.

(continued Additionally, every attempt to resend the reply fails. This has
happened with two e-mail addresses, one to "gmail.com" and one to
"sbcglobal.net." I am able to send new e-mails and receive all e-mails. I am
not sure why I am unable to reply. Is anyone else having this issue? If so,
any suggestions on how to fix it? Thanks!