Oh crap. Gmail is deprecating support for picking up mail from a remote server using POP3 polling in January 😭 Given that I switched to this mode due to reliability problems with direct delivery via mail forwarding, this really sucks...
update on the POP3pocalypse. it appears that the most likely thing to work in the future will be to use SMTP forwarding to gmail with ARC headers added to the mails, going by comments on @jwz 's post at: https://www.jwz.org/blog/2025/12/today-in-google-broke-email-2/#comment-265285 , and it looks like there is a rather complex Postfix/OpenARC setup that may do the job. really looking forward to having to do this soon
Today in "Google broke email"

I have just learned that, beginning in 3 days, my employees will no longer be able to receive their work email. Apparently Google is dropping support for Gmail accounts being able to fetch mail from outside accounts. At all. And they announced this change less than 60 days ago. (The announcement was in the basement, stairs, leopard, etc.) What I want to accomplish is simple: When email ...

@jmason reminding myself to look at this later. I have a thing forwarding to Google that’s been broken _forever_ and it looks like this voodoo may help.