I was thinking through an idea where relations (vendors, subscription services, people) were each given a unique individual address associated with a single account, so any emails sent to that address (but not originating from the relation) could be identified as a compromised address (sold, given away, or stolen by hackers). After researching it a bit, I came to realize that Yahoo! (https://help.yahoo.com/kb/mail/SLN3523.html) and GMail (http://www.spxtech.com/creating-disposable-emails-using-gmail/) already allow this. Maybe I am losing my tech edge. I had no idea. I've never heard about it.

The GMail approach is meh. It exposes your base address and anyone familiar with how GMail does Disposable Email Addresses can easily divine the base address and use that instead. Yahoo! employs an alias so the base address is not exposed, although I am not sure how an alias without a suffix is treated (it should be discarded). Anyway, this is a neat way to add accountability to email addresses given out and provide a means to drop an address and having to notify only one relation vs having to notify everyone of the change. I may bite the bullet and go through the headache to drop my current address and set up a new one with an alias and start using DEAs. Would be nice to see who is compromising the addresses I give them.