Have you ever received this error from pop.gmail.com?
-ERR [SYS/TEMP] Temporary system problem. Please try again later.
I did. It turns out that if you try to use SSL on port 995 and login using the USER and PASS commands, you will receive this error if you either: 1. tried to base64 encode your user/password data or 2. you did not setup an “App password” and use it instead of your normal password.
That’s it for now. Good luck!