Bounced email in infinite loop

I have a number of incorrectly captured email addresses that are getting bounced by postmaster. The problem is, I have no idea where on SharePoint they are coming from.

Is there any way of determining where an email address originates from within SharePoint?

Obviously there is no way to track manually (Ad-hoc) typed emails, so I'm looking for the ones that may be in a list or workflow, etc...

I know very little about Servers and AD, and a fair amount about SharePoint. I have the email address but need to know where they're being sent from.