glad to hear you are having your usual great weekend with the boys.
On the subject of the email/text contents, I particularly do not like the inclusion of the first sentence of the second paragraph which starts, "Your adultery goes against ...." Don't think that needs to be in there at all.
Actually it doesn't sit well with me for you to be sending her anything. I just think that when you weigh it out, what do you stand to gain from sending her anything. Not like you can change her behavior/conduct, cuz we both know that you can't. And the other interesting part about this whole thing is that while it is really F'd up for her to be saying crap about you in front of the boys, they certainly seem to be able to see right through her BS. Of course, not that kids as young as your's should be having to go through that. IMO so far, it was an isolated incident as far as I can tell (unless you have other info that would refute this)of her bad-mouthing you and making sure that the boys overheard it. Do not give her the satisfaction of responding to the crap she is pulling. Perhaps by not giving her that attention, the behavior will dry up and cease. In any case, unless there is more to it then I am aware of I would refrain from letting it be known that you have discovered this has ocurred. If this turns into a pattern of behavior then that is a different situation and a line would have to be drawn to ensure the protection of your boys. Bottom line is I would advocate not being so reactionary to her BS. I think she feeds off the attention that you would be showing her. Do not allow her to see that she is getting to you. And do your best to not let her get to you.
