Oh yeah. There is another reason it's hard to give up. They don't want to be the "bad guy". They already hurt us (and often think they'll never live it down) and don't want to hurt someone else (who they have a clean slate with and are the hero).
I know how tempting it is to make sure she doesn't think HE was contacting her. BTDT. I don't know, I guess I'd be tempted, now that I understand why you'd email her, to send one more email saying it is me, there is nothing you have to say that we are interested in. Please stay out of the new life we have committed to creating together. That sounds hokey I guess and probably a bad idea, just saying I understand why you want to send one last email to let her know her revenge tactics didn't give her what she wanted.
No good will probably come of it though. I've resisted contacting our skank with a rebuttal to a letter she mailed him telling him he was clearly making a mistake to give up the happiness he deserved because "God wants him happy"... oooh, this is sending me where I don't want to go... the letters I found tore me up Limbo... anyone can see that if I push the "submit" button. I'm going to anyhow though because some things just can't be unlearned.