It's hard to get rid of toxic people, so good job!

I can see your dilemma.

In relationships with other people, I've done both things. One time I simply cut off all communication and never spoke to the person again. Another time, I voiced the issues and then stopped all communication.

I guess it's what you want to get out of it. Do you want to just simply leave that part of your life behind or do you want him to know why and how he screwed up?

You could always read the email, and respond if necessary, and then tell him not to contact you any further.