I know there is a section for potential spam mails. But I wonder whether Proton block some of them so that they won’t even reach that section. I am using it as my primary email right now and recently a recruiter tried sending me an email for tech discussion but it never reached my inbox. They were sure it was sent, and I later received it on my alternate email (gmail). Is there any possibility that this could have happened for other reasons?
Nothing you can do until they fix it. If they really want to recruit you that bad, ask them to send the email to themselves and forward it to you.