Interrogation POP3 et envoi SMTP échouent soudainement

[JammyDodger]

I think you now have to enable 2FA on your Google account, and set up an app password:

Connection to the POP3 server is failing with an authentication error. Please check your POP3 settings

I recommend turning on 2FA on the account and setting up an App Password for Discourse. The policy change is about the “allow less secure app access” option being deprecated. More info on this here: