Some people say you can mess up so bad you don't even know how to come back at an individual. Over 4 years ago I went NC with my ex-girlfriend who used me, and told me she planned breaking up with me and talked about stringing me along on time apart with her friends. I walked away and never looked back even when she tried to contact me 2 month latter after the breakup lying saying I was the one who wanted all of this I never responded. Fast forward to present year, back in June I got a chain email and it was from her to me. Just over 2 weeks ago I get another chain email from her and it had “Hi”, I never replied to the emails. Don't you have to add people to chain letters what do you guys think mistake or purpose.

Just continue to ignore them... she is an ex for a very good reason. She should remain an ex for those very same reasons. Just delete the email without reading it. Otherwise you will be reopening old wounds. And that's never good for anyone involved. Doesn't matter WHY. Intentional or mistake.

Even better is to create a rule that takes any email from her and send it directly to the spam or trash folder. Out of site, out of mind.

Here's the deal: 50% mistake, 50% on purpose.
The real question is what the reason would be if on purpose, and the reasons could fill a book.
There's a chance that the reason is the first one that pops into my mind: she wants to make you guess and go crazy and write to total strangers like us to see if we know.

What does it really matter? Don't respond. Delete her from your email account or make sure her emails are sent to your spam folder.

There are two things that come to mind. One, her computer got a virus or something and it is scanning her entire address book and sending it to every one. The second is that she's doing it. Better safe then sorry. I completely think it is something she's not doing with you in mind or any malicious purpose behind it.

As smoothy said, make a rule in your e-mail to shut it off to the trash. I have done that with my ex-wife, it gets marked read and moved to a folder that says "Ex-*NOT A NICE NAME A WOMAN*" without me seeing or knowing. I don't know if I have gotten anytihng from her in the past several years.

I abhor chain emails. After 4 years it's time to completely move on.