Hi

I am unable to Send e-mail messagein OUTLOOK 2010:   The server responded: 550 5.7.1 Message rejecte. Have tried solutions from various sites ..no joy. Had no problens when using OUTLOOK 2007

Thanks will apreciate your help

Regards

Was the the complete error message?  If not, post the remainder.

Thanks Brian, yes that was the complete error message. Just to add we are using Exchange Server 2010

Regrds

I have the same problem sending emails in Outlook 2003 the error message is 550 5.7.1 relaying not allowed: ??? email address. It has to be Outlook's issue because I have other email accounts in Outlook that I can send emails from. How do I fix it? Can anyone help?

Did anyone find a solution to this?  I'm getting the same error suddenly.  Thank you!