IMAP settings not accepted (proton mail config)

[cyberzork]

See this Em Client Proton Mail Bridge thread that might help you too.

ProtonMail Bridge and New Account Configuration

This is a step by step to install a New Account using ProtonMail’s encryption Bridge. THERE IS A TRICK TO SUCCESSFULLY COMPLETING THIS - IT’S PATIENCE.  After I completed the account setup the messages were inconsistent and erratic - sometimes header info would show up - sometimes even the body of messages, but never a complete encrypted message. I COULDN’T GET IT TO WORK SO I KEPT TWEAKING (and I’m not a “tweaker”).   THIS WAS A MISTAKE.  So I did a complete new Account Setup as below and then…