The IP address change was from spinning up a new server on DigitalOcean.
From what I could gather, changing the IP on a mail server is seen as suspicious and resets your reputation level. Google handles this by “safely” marking all of your mail as spam, I guess until your reputation is restored, which is nearly impossible since nobody will see your mail.
From what I could gather, changing the IP on a mail server is seen as suspicious and resets your reputation level. Google handles this by “safely” marking all of your mail as spam, I guess until your reputation is restored, which is nearly impossible since nobody will see your mail.