I can only, only speak for me specifically in answer to your 'does he read them' question. This is hard for me to say-admitting to what I feel is shameful behaviour is tough-even admitting it is shamefull to please bear with me. I do not read these things mostly, at least 'at first'. Having begun the isolation and avoidance, it's incomprehensible to me that others could possibly, POSSIBLY be so kind and understanding as to not be 'mad', hurt and horribly disapproving- I do not wish the further pain of seeing what I (perceive) I've done to them so avoid the emails, too. It's some self- feeding cycle of self dislike that is hard for others to crack.
For what it's worth, I feel you're sort of doing the 'right thing', leaving the door open. Maybe he's not readiing your emails but he's getting them. Complete silence would say to ME that I've wounded the other person beyond repair, they are out there having completely written me off in anger and disgust. Perhaps change the tenor of your messages, and content, so they are not too emotionally charged for him to deal with, nor so frequent he's made reactive and can't even pause long enough to notice your acceptance of him.
Again, this is terribly specific to ME- as a world-class avoider for 20 years. I'm really good at it, and even working now very, very hard with the T to change this it's still my 'drug of choice'. We're meant to reveal bits of ourselves here, to shed light, help others to trust. I personally have a tough, tough time doing that because letting go of containing things feels just plain awful. If I feel like a schmuck and total jerk admitting to this nonsense I 'do', he's probably in some even worse state of self-dislike. It's hard to overcome, but just did want to say that this complete and utter acceptance of him thing you're so clearly capable of is definitly something which could make the difference in the end, if you have the patience. It could turn his isolating time into a time of healing, not one of shame and further self-hatred.
I hate to beat that poor, proverbial dead horse some more, but feel the need to say again, this is *just* what it feels like from the perspective of another avoider out here, so could be entirely off base.