A friend and I were both getting an error message today when trying to use an IMAP mail account with Outlook Express.

The message could not be sent because one of the recipients was rejected
by the server. The rejected e-mail address was ‘recipient@recipient.com’.
Subject ‘sup’, Account: ‘mail.myserver.com’, Server:
‘mail.myserver.com’, Protocol: SMTP, Server Response: ‘553 sorry, that
domain isn’t in my list of allowed rcpthosts (#5.7.1)’, Port: 25,
Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79

This occurs apparently because the server is set to ‘POP before SMTP’ meaning you must get mail before you can send it. With a POP3 mailbox set, you must go to RECEIVE ALL before you can SEND ALL. At first I thought this would be an inconvenience because POP3 naturally downloads the mail from the server, making it only accessible to one computer. This, however, is fixable by setting the option to “Leave a copy on mail server”.

So the fix is to go ahead and make it a pop3 box with that option from above set.

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