Hi!
Our senders are sometimes receiving the below error message while sending emails to our Exchange 2010:
Delivery Failure Report
Your message: Re: Mail error
was not delivered to: our receiver email address
because: 550 < our receiver email address
No such user here<o:p></o:p>
What should you do?
You can resend the undeliverable document to the recipients listed above by
choosing the Resend button or the Resend command on the Actions menu.
Once you have resent the document you may delete this Delivery Failure Report.
If resending the document is not successful you will receive a new failure
report.
Unless you receive other Delivery Failure Reports, the document was
successfully delivered to all other recipients