PopMan

The user name must be the full email address (including @gmail.com)

So you only get some but not all of the emails to your GMail account in PopMan?

Note that by default you only see new (unread) email in PopMan with IMAP4 protocol.

Please send a screenshot of the problem.

If your version of PopMan is at least 1.3.16 then you can try to use protocol "POP3 SSL".

Otherwise, I recommend using IMAP4 protocol instead of POP3.

Changes:

(+) Rules: New action for setting font color of message, e.g. Subject contains "Alarm" -> Color("FF0000")
(+) New theme ModernFlat by Brausebart
(*) Updated theme FarmFresh by Brausebart
(*) Updated translation for Hungarian

I suggest you simply try it out.

Yes, you only need to do the OAuth Sign-in once.

PopMan 1.3.16 support OAuth sign-in for GMail for both IMAP4 and POP3 TLS.

All the options you mentioned work. There have been no changes to them in recent versions. I would still recommend updating to the latest version 1.3.16. If you have installed PopMan 1.3.8 then simply download the current installer and run it. If you have used the ZIP archive distribution then downl...

Changes: (+) Update SSL libraries used by protocol "POP3 SSL" to add TLS 1.2 support independent from operating system (+) New menu "View externally" (F11) will save mail to file with extension eml and open it (+) New theme FarmFresh by Brausebart You can use the new menu "V...

I don't understand what is not working. Can you explain it in more detail?

Yes and no. I used a slow function to convert text to lower case (for case insensitive finding). In one byte ANSI mode that function was fast enough but in Unicode mode it was much slower. I replaced it with a very fast hand crafted function.

PopMan 1.3.15 adds support for POP3 access for GMail OAuth2

I found and fixed the problem. PopMan 1.3.15 should be as fast as 1.3.1 again...

PopMan 1.3.15 supports POP3 with GMail OAuth 2 sign in.