I am a new outlook user, and I have set both of my current e-mail accounts to
pool into Outlook. One is an adelphia webmail account, the other is a
FirstClass account. I am not having any trouble receiving mail, but I cannot
send mail. Perhaps one out of every 10 messages I send actually reaces the
intended reciepent, I get the floowing message every time:

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

Subject: ...
Sent: 5/3/2006 12:30 PM

The following recipient(s) could not be reached:

'address' on 5/3/2006 12:30 PM
550 5.7.1 address... Relaying denied. Proper authentication
required.

I have tried set up the password to be protected during authentication, but
then it again refuses to send saying something about the authentication not
being supported..... HELP!