There is a way Eudora could still be used with gmail without App
Password and/or 2-Step Verification.
By using Email OAuth 2.0 Proxy (which is Python program) Eudora can
still be used exactly as before.
I tested both POP and IMAP access (even both in the same time) and
everything is working without problems.
Here is the link to the proxy:
Two weeks ago the program still didn't support POP but author added it
upon my request and it works very well:
The configuration takes some time but once everything is set up Eudora
again works as before without enabling App Password which requires
enabling 2-Step Verification and using a phone.
My suggestion is to first read through all closed issues and to use
some test gmail account to see how everything works. I was using
Windows 7 in virtual machine + Thunderbird + Eudora + TCPView +
Wireshark to debug the problem with Eudora + IMAP.
The proxy can run on the same computer as Eudora or on another computer
in the local network - it can even be Raspberry Pi or Orange Pi PC.
Porting the program to Python 2.x (for those who are still using
Windows XP) is work in progress.