[MlMt] After upgrading to Version 2.0 (6255) my mail is not retrieved anymore

[leo]

Hi there

I upgraded to Version 2.0 (6255) -- from something like 6122(?).

Now no mail from my provider Fastmail is received anymore and I cannot send email either. (I write this in the web client!!!!)

Additionally MailMate tries to open a webpage at Fastmail now to authenticate, but I have (a while ago) added a app-specific password for Fastmail to MailMate.

What's going on here? How do I downgrade to a working version again?

ps: My machine is fairly old: Intel Macbook with macOS 12.7.6.