@kirby @Inginsub
You can increase Pemorla's own log verbosity to debug and see what's going on.
I have hydroxide ProtonMail bridge thingie running locally, it works as SMTP server, I think I just pointed my Permombler to it, host port, login, password — and it worked, I didn't spend a lot of time on it.
But it might be tricky for remote SMTP server.