Please don't post it,even after the divorce,it will only stir things up agai.
In all this we must try and put your Dad first.
I know it's easy to play " tit for tat" but if this woman is genuinely mentally ill(or even not) it won't get you anywhere,she will go on doing what she does now even after the divorce.
What you have to do is(in a way) regard her as dead.Don't answer any emails,don't contact her,and especially don't ring her.If she rings you,and you know her voice,don't say anything just put the phone down,or let the phone ring onto the answering service.
Believe me it's better to cut her out of your Dad's life,and your families,that to allow this bickering and retaliation to go on now and AFTER the divorce.
Nobody wins in this pointless war,and the one that gets wounded most woll be your poor old defenceless Dad.
I know it's difficult not to rise to her taunts,but in the end you will be the winner and she won't.