Was this an apology?
Well, yes it is an apology and we should take that attempt as an apology however we should do so in the vein that the person concerned didn't like to give the apology, like they were forced, and it could be a reflection of their immaturity...seems like it.
We often see things only from our viewpoint within the framework of our own values. If we saw it from their viewpoint you might realise they are apologizing in a genuine manner- for them. But not in our view does it seem genuine. This is where we should be flexible, people are shades of grey not black and white.
Abusive emails- if you receive one- ring them! if it continues- break off contact. You have choices.
Beyondblue topic the definition of abuse