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How to fix Error: 503 Valid RCPT command must precede DATA

Recently got this error "503 Valid RCPT command must precede DATA" when trying to send an email in Outlook?

The most common reason for this error is an incorrectly configured mail client.

Reason: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

What does a "Reason: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)" error mean when an email message bounces back to the sender?

The following error will be bounced back to a sender if the email address the sender is trying to send to is not fully activated:

"Reason: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

Outlook Express missing in Windows 7 Vista

You can not find the Outlook Express software in Windows Vista

You can not fine the Window Live mail in Windows 7

For those who were looking for Outlook Express on Windows 7 and windows vista, sorry, the program is long dead.

Here is the solution