Thanks, but it was sent to us from someone else. They put .com instead of .net and we are unable to get in touch with them but need what they sent!
Is there anyway to retrieve such a thing?
No there is not.
Does that address exist out there somewhere?
Unknown, but most likely not.
To check, for example, you could:
a) Go to http://network-tools.com/
b) Select E-mail Test
c) Type in the e-mail address into the provided field (which by default has your public IP there)
d) Press Go