Outlook won't allow me to send emails

[ka1865]

I have outlook 2000 and I can recieve emails, but it wont let me send emails.
This message was sent to me after it happened, but Im not able to do what it
says. "If you have received this error message, you will continue to receive
it for emails sent with a non-verified address until you verify your Yahoo!
email address or any other non AT&T email addresses (e.g., (e-mail address removed),
(e-mail address removed), (e-mail address removed), etc.). Verification instructions are
available on the AT&T Help site http://helpme.att.net/article.php?item=11646.
If you have already verified your non AT&T email address and are no longer
receiving the 553 error message, please disregard this email." Thanks for
any help

 

[Brian Tillman [MVP - Outlook]]

I have outlook 2000 and I can recieve emails, but it wont let me send emails.
This message was sent to me after it happened, but Im not able to do what it
says. "If you have received this error message, you will continue to
receive
it for emails sent with a non-verified address until you verify your Yahoo!
email address or any other non AT&T email addresses (e.g., (e-mail address removed),
(e-mail address removed), (e-mail address removed), etc.). Verification instructions are
available on the AT&T Help site
http://helpme.att.net/article.php?item=11646.
If you have already verified your non AT&T email address and are no longer
receiving the 553 error message, please disregard this email." Thanks for
any help

You're trying to send mail from a non-AT&T Yahoo address using the AT&T Yahoo
server. That's not allowed until you follow the instructions at the URL in
the error message. It won't take you more that about three minutes.