Comment by kldg

not to say this "should" be the solution, but does Proton not offer easy email filtering & automation (e.g. skip inbox, delete)?

I ask because I haven't yet bothered to implement it on a from-scratch email server I stood up a couple weeks ago (just kidding; I wanted to brag about SPF, DKIM, and DMARC test passes from Gmail with both inbound and outbound encryption). I can say from this experimentation and using Google's Postmaster tool, though, that emails being reported as spam by users is *very* serious; Google's threshold is 0.3%; if just 0.3% of users report your email as spam, it's considered a policy violation and your emails are likely to go to spam or have delivery refused outright. idk what Proton's policies are. (edit: by extension, this means enforcing authorization of users is very serious; if someone abuses the service as an open relay, your whole domain is toast)