Something weird definitely happened when upgrading to 8.2.1. It looks like it is not the PTR record, but rather DKIM fails (even though the records are correctly added to my DNS).
My bounce messages from Google all specified PTR so that is why I made this post.
I switched to a mailgun relay for the holiday break as I didn't have time to try and troubleshoot this.
DKIM is still out.
As I saw someone else posted in the Freescout, Freescout also stopped being able to check for mail.