My protonmail account is free and I rarely sent emails with it. I receive more emails from bitcoindev announcement list and another newsletter which isn't crypto related. Now I'm really a bit disappointed of protonmail, especially when their own spam blocker doesn't quite explain what went wrong.
I can only guess that's intentional to avoid real spammers from trying to bypass it, but I've only sent about 14 emails for this campaign so far and it appears the blocking from protonmail started way earlier and I confused it with spam blocking of the registrars. This sucks from protonmail.
Oh so you must be having the same issue with me, don't you?
Yeah it's a pain in the @@ but not much I can do unfortunately.
Well, if privacy is not a big concern for you then you may use Gmail. I've reported all of the domains via Gmail and all of my mails were sent within seconds. So here gmail works pretty well.
It is one of my big concerns, so I don't think I will use Gmail, but I am certain that if I used it, I would receive instant responses like you said.