I think they’ve technically required DKIM and SPF for a long time, but they have been rolling “improvements” to spam filtering lately, so it’s probably stricter than it used to be.
Discussion
I’ve never had dkim and I’ve never had an issue until recently, so yeah it looks like I was caught in some spam war crossfire
No DKIM records will wreak havoc. Every major provider is rolling out scoring.
I was just looking through how to set this up for self hosted. Doesn’t look bad, just annoying.