How do I use a POP email client to work with Gmail emails?

Question

gmail

Under the link https://support.google.com/mail/answer/7104828
Item 4 - In the "POP access" section, there is a choice either this or this:
Enable POP for all letters
or
Enable POP for letters received from now .

What's the difference, who knows?
Chew please.

Answer 1

in that all letters or only letters available from the moment the POP3 protocol was enabled will be available via POP3, excluding the old ones,
it is logical