Mea culpa: I relayed an email hoax without checking. A reminder: this is the email from one Mary Callahan, mistakenly...

Mea culpa: I relayed an email hoax without checking. A reminder: this is the email from one Mary Callahan, mistakenly sent to a suitor, when she meant to forward to a girlfriend. See below. But I just tried sending an email to the supposed sender, and got this reply.

Subject: Misdirected email
was not delivered to:
mary.b.callahan@us.pwcglobal.com
because:
User mary.b.callahan (mary.b.callahan@us.pwcglobal.com) not listed in public Name & Address Book