[Users] Not downloading from Gmail

[John Jason Jordan]

On Thu, 08 Dec 2016 23:11:49 +0000
Richard <lists-claws at listmail.innovate.net> dijo:

>> [14:25:24] POP3> USER johnjasonj
>> [14:25:24] POP3< +OK send PASS
>> [14:25:24] POP3> PASS ********
>> [14:25:24] POP3< -ERR [AUTH] Web login required:
>> https://support.google.com/mail/answer/78754 *** error occurred on
>> authentication *** Authentication failed.
>> 
>> Apparently this is where the problem lies, but I can't figure out
>> from the above how to fix it. Can someone give me some clues?
>
>Did you happen to "recently" change your google account to 2-factor
>authentication?

Not that I know of. But then, I don't know what 2-factor authentication
is, so maybe I did without being aware of it. I'll ask Google to
explain it to me.