Did you get an email error message that looked like this...

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '<email address>'. Subject '<Test>', Account: '<Test>', Server: '<smtp.example.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.

Yes, lets look at why you got the error message?

Basically, your message was rejected because the outgoing e-mail server (SMTP) did not recognize you as an authorized user of the mail account.

Its due to spam... The Internet was designed before anyone considered the implications of providing the ability to send millions of pieces of junk e-mail for little cost. Spammers use the relaying ability of SMTP servers to mask the true origin of the junk e-mail by relaying it through third-party servers that permit such open relays. This makes the junk e-mail appear to come from the site that relays the message and conceals the identity of the real sender.

Until recently, most SMTP e-mail servers worked on an open trust system. Under this system, anyone, anywhere could submit an e-mail message to an SMTP server, and the server would accept it and forward to a recipient.

2 ways to fix the email error message...

1. SMTP authentication

Just as you must use a password to access your incoming server for your e-mail messages, this option requires that you provide a user name and password to send e-mail messages. Look for a tick box in the account settings such as "My outgoing email server requires authentication".

2. Receive mail before sending

Receive your email first, before sending one. This is called POP Before SMTP authentication. You may have a checkbox for "pop before smpt" in your version of Outlook - if not then you just need to make sure you check for new mail first before sending mail.

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