I can get IMAP to set up properly, but SMTP times out in diagnostics with the suggested setting of 127.0.0.1 and port 1025. Any ideas?
As long as you have the correct SMTP Settings, timing out errors when sending email can be related to (optional) Antivirus Scanning / Internet Security Email Scanning programs etc. So if you have any of the above, disable to test.
If disabling any optional Antivirus programs or Security programs etc, update this thread with your SMTP Server settings.
Here is also an eM Client User posted Proton Mail Bridge acct configuration. See below thread.