Honestly, I know this is entirely subjective, but I never liked the vibes from proton especially in the last year. I’m going to use my animal instincts and just avoid them.

That said, I really need new email service so looking at options

The process makes file to read via http (not https), it’s just a nonce ( some random characters). Once their server reads that file, using the domain (and not the ip) and compares with what is expected, this shows you own the domain , and they give you a new ssl cert, modifying your server’s https configuration file (usually). And deletes the file it made .

Hi, just a guess. But

The retryafter=86400 value is too large (> 600), will not retry anymore.

Seems to me like the call to your server in the verification step is failing.

Do you have port 80 blocked or stopping the call in another way ?

I secretly have forgotten a lot of the working code I wrote months ago; and whenever someone asks, I need to go back and read it like new