New Frontiers in Spam

I just got an email at work that looked like a reply from a registration confirmation, only it came from an sbcgglobal.net email address. I wonder if spammer's are harvesting information from email receipts sent to typo-ed email addresses. For example

1. Sam mistypes his email address sam@sbcgglobal.net
2. Receipt email goes to the spammer server set up at sbcgglobal.net instead of the intended sbcglobal.net.
3. Spammers now have name and other information, like address, to go with the email address (since they know things that come to sbcgglobal.net are intended for sbcglobal.net).
4. . . .
5. Profit!