What does "SMTP Authenticate" mean?

[Bob Newmam]

This error message was received when Outlook bounced back an email I sent,
it would be nice if they told me what SMTP Authenticate means and how to do
it.

Help please... Bob

*********************************************

The reasons given by the server are included to help you determine why each
recipient was rejected.

Recipient: <[email protected]>

Reason: You must SMTP Authenticate before sending to (e-mail address removed)

 

[Oliver Vukovics]

Hi Bob,

have a look on this sites:

What means SMTP Authenticate?
http://www.cablecom.ch/en/smtp

How to configure Outlook SMTP Authenticate:
http://www.itc.virginia.edu/desktop/email/smtpauth/outlook2003.html

Maybe it helps.