For the past several years, I have had K9 configured to connect to Gmail via IMAP and it has always worked well.
I recently changed my gmail password. But when I attempted to update the PW in K9, it refused to accept it.
Now K9 is not receiving messages.
I have my own domain name and have lots of email forwarders that all point to my Gmail address. I use K9’s “manage identities” feature to send via these other addresses.