email Error message - How to decipher

I received this vague error message from a person I normally send emails to.
What are the reasons for this happening?

A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk
Who is Participating?
Peter HutchisonConnect With a Mentor Senior Network Systems SpecialistCommented:
That is not a normal Email Non delivery report. You should also get a code with it e.g.

5.1.0 Bad address
5.1.1 Email account does not exist
5.5.0 Generic protocol error.

A list of codes is available at;en-us;284204
which can help diagnose a problem with emails.
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