Today in "Google broke email"

Dear Lazyweb, if I have to self-host IMAP for my non-nerd staff, how do I deal with filtering?

I am *begging* you to read the whole post before replying:

Currently, my staff emails arrive at their @dnalounge.com address and Postfix forwards to their Gmail addresses with all of the usual DMARC/DKIM/ARC/SPF flavoring. It mostly works. Mostly. If I am interpreting this page correctly, it says that starting in January, Gmail is going to ...
https://jwz.org/b/ylC1