Heads up! Gmail will no longer support checking emails from third-party accounts via POP. https://support.google.com/mail/answer/16604719?hl=en
Learn about upcoming changes to Gmailify & POP in Gmail - Gmail Help

Gmail will start removing support for the following features: Gmailify: This feature allows you to get special features like spam protection or inbox organization applied to your third-party email

@nixCraft This is very bad.
For some years, the standard advice to people who want to get all of their email consolidated into one Gmail account was to use POP because forwarding is problematic for #spam control. TL;DR: If you forward spam to Gmail, they’ll block you.