POP is alive. Maybe, if you share your settings, and any error messages, some suggestions will come forth. thank you

GlowHost appears to support POP, IMAP and SMTP, although IMAP is recommended if you access the same account on multiple devices:

https://documentation.glowhost.com/pages/viewpage.action?pageId=2818162

If you have problems adding accounts, disable the account hub in Settings/General and add them from ≡ - New Account - Email.

I understand IMAP is supposed to be the way to go, but I have always used POP3 successfully and with good order. If I delete an email from one computer, I may want it to still be available on another where my purpose is entirely different.

Port: 995 Security Settings: SSL/TLS Normal Password

Port: 465 Security Settings: SSL/TLS Normal Password

When using these settings, I don't get email, but I also don't get an error showing up on my screen that Thunderbird could not connect to the server. I believe I got past that problem by changing the server name. I also just noticed that at the bottom of the page it flies through a checking description, the last entry is "Checking mail server capabilities..." .

Thanks Bob