> What does this error means?
> 550Your message does not conform to RFC2822 standard (in replyto end
> of DATA command)
It's often an indication you have an add-in, like an antivirus scanner,
interfering with the communications between Outlook and the server.
> What can i correct this error
The first thing to do is to uninstall your AV program and reinstall it
without the mail scanning feature.

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Brian Tillman [MVP-Outlook]