I *just* found out that my MIL has been using my personal email address to sign up for things (ie. one-time wine making courses, etc.). She can't use her own personal email because these things that she signs up for are one-time deals in which they track email addresses. So she uses mine!
I found out about it because I received a bunch of reminder emails about this appointment and that event, etc. It's my email address but she typed in her own name.
UGH!