[dhdjddhx]

I have anecdotally heard that proton has some more deliverability issues than Fastmail since it’s more preferred by scammers for its privacy features. That influenced my decision since I was probably already going to face some delivery challenges being on a custom domain.

[sebastiennight]

My anecdotal experience has been the opposite. We used to have an old email domain which, due to Google workspace misconfiguration, had terrible deliverability. Switching to Proton solved all our problems on that side.

[upofadown]

Deliverability issues with which email provider(s)? Often times it turns out the problem is just with Gmail.