I received an email from an undesirable person that I would like to return to
him... I know I can block him and I will from here on out, but I wondered if
it is possible to send the email back upopened so that he understands I do
not want emails from him.

No, just delete it. Send him a separate mail informing him that all received
mails will be deleted unopened or simply ignore the mails altogether.
"Return to sender" is a snail mail feature.

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
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http://www.msoutlook.info/
Real World Questions, Real World Answers

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"Terri" <(E-Mail Removed)> wrote in message
news:812FCB7B-BE1D-4651-A033-(E-Mail Removed)...
> I received an email from an undesirable person that I would like to return
> to
> him... I know I can block him and I will from here on out, but I wondered
> if
> it is possible to send the email back upopened so that he understands I do
> not want emails from him.