After setting up dkim, dmarc, etc. I've had no problems in the past decade except for one person using aol. I told him that his email was broken and if he wante

After setting up dkim, dmarc, etc. I've had no problems in the past decade except for one person using aol. I told him that his email was broken and if he wanted to receive my email he needed to fix it. I don’t count such things as deliverabilty problems, but as receivability problems on the other end. I’ve never sent any kind of bulk email and I suppose my host has a good IP. Everything I do depends critically on email deliverability, often to addresses I’ve never sent to before, so if I had a problem I would certainly know about it.