Morning Mo I looked up messenger it says if you try send a message and you have been blocked he will see a triangle saying message can't be delivered as he's been blocked.
I am more concerned now about him coming home and your safety. Before I always pictured him as some sad wet dish cloth money obsessed type. But I don't know his last email made me feel uneasy. Obviously we don't really know him and impossible to call how someone will react, but really pleased that you have options to go too if needed.
Do kids now how to call police or how to call your mum of friend just in case? I would be tempted to get advice re having him back or say if he does insist on coming back to stay at the house you will take kids to a refuge while he's back. And what kind of father would make you do that if you can afford to stay close by instead? It does seem bizzzare if there's been abuse but not voilence but you are concerned you can't do anything until/if he ever does.
Just think all this shit he's giving you is going on your rose bed. He thinks he's given you shit - he can't see you are sucking it up and making you stronger!!!