OUTLOOK won't send to @btinternet.com tho' OE will

[Tom B]

My new OUTLOOK won't send to @btinternet.com tho' OE will. I get an error
message that the recipient is not known. Yet my OE/Windows Mail sends
perfectly to these addresses

 

[VanguardLH]

My new OUTLOOK won't send to @btinternet.com tho' OE will. I get an
error
message that the recipient is not known. Yet my OE/Windows Mail
sends
perfectly to these addresses

Use the same e-mail address in Outlook that you used in Outlook
Express. It is not Outlook that is complaining. It is the receiving
mail host that tells your sending mail host that there is no such
recipient there, and your sending mail host sends you back and NDR
(non-delivery report) to tell you that you used the wrong e-mail
address or simply that there is no one there by that address. You'll
have to use the correct e-mail address no matter what e-mail client
you use.

 

[Brian Tillman]

My new OUTLOOK won't send to @btinternet.com tho' OE will. I get an
error message that the recipient is not known. Yet my OE/Windows
Mail sends perfectly to these addresses

You have your account misconfigured.