You may find as in my case, that your x may continue to hound you, bash you, complain about you, etc. Hard as it may be...ignore it.
Know what works best for that, FM? If it's not business related, let it go. Eric is spot on - she's the one with the problem - don't make it yours.
As for the responses to her emails - I suggest if it's legit business, that you respond cordially. You are responsible for your actions. So be responsible and hold yourself up to the standards you expect of yourself. Regardless of what she does.
In fact, expect that she'll sink lower and more vigorously say things about you as time goes on. Expect nothing more than for her to try to hurt you and say untrue things and to hound you for a long time.
Outside of business items, the more you ignore them the sooner she'll stop (if she does of course.) Each time you respond to her or her current bf regarding anything other than business, the clock starts over.
Over time, it becomes easier to deal with although it may remain annoying in some small way that you will have to deal with it. Many go through that - you're not alone.
And as Eric said, "it could have been worse." That's very true amigo.
Glad things are moving forward for you!
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."