Google seems to be on a path towards requiring more security for GMail, with an apparent end point of requiring all apps accessing it:
- To be 'verified', a process apparently very heavily tilted towards web services, not things like FFF, see link;
- Use their RESTful APIs (instead of standard email IMAP4), preferably with their python libraries--which are some 30Mbytes vs FFF's current 1.8Mbytes; and
- Authenticate through OAuth2, which requires a manual user interaction with Google in a browser, whether that's an instance started in FFF, or the user opening a URL in separate browser, and copying codes back and forth. No idea how often.
Gmail appears to be trying to pull into a more walled-garden kind of place in the name of security.
Which is kind of good--Email is really old and it's original security was non-existent. OTOH, it's also hilarious--you've already given all your data to Google, the largest data mining/advertising company to have ever existed.
I added Email fetching because it uses standard interfaces and was relatively easy. I have always included the warning:
It's safest if you create a separate email account that you use only for your story update notices. FanFicFare and calibre cannot guarantee that malicious code cannot get your email password once you've entered it.
Use this feature at your own risk.
For the time being, I think my official answer for GMail is going to be the
"Sign in with App Passwords" feature. Bonus: It works with accounts set to two factor authentication.
If they do take away App Passwords too, GMail will probably become unsupported in FanFicFare and the answer will be 'use a different email provider for your separate fanfic notices account'.