Sending Email in Outlook

[Walt P]

I'm running Windows XP Pro and Office XP Pro and set up a
profile in Outlook. The profile is identical as profile
on another system but when I try to send a test message, I
get the error, 'Can't send message, check email address".
I've retyped the email address and password several times
but it won't send. The other system who's settings I
copied work fine. Any help you can give would be greatly
appreciated.