They also started using new IPs without PTR records to send out mail. Though so has Microsoft just recently. Both heavily frown upon that when receiving mail themselves. Do as we say...
I hate getting a report telling me my work domain is blocked because it is missing a PTR record and we use Exchange Online. I can’t do anything about that!
Yep, whenever I start a new job I say "Don't worry, because iamverysmart, you don't need any Microsoft products!" I am then hailed as a genius, everyone claps, and I get a big fat raise.
The snarky „just don’t use Exchange, duh!“ doesn’t either. It’s a non-solution that armchair experts provide, who aren’t responsible for managing mailing for lots of people.
Complain to your provider. You're paying for the service, right? They should run a properly configured mail exchange and part of that is having PTR records. If they can't manage that then it's time for a serious discussion about changing vendors.
Not only does Apple frown upon that, they just silently drop emails that are sent from a server without PTR records. Yes, that includes their own servers. Yes, sending email from iCloud to iCloud is silently dropped if they decide you get assigned an outgoing server without PTR. The absolute amateurism just blows my mind.
It's incredibly entitled of some big cloud based operator to send mail from an SMTP source that doesn't have proper reverse DNS. Any normal independent small operator sending mail without proper reverse DNS will increase its likelihood of spam rank by a thousand percent. Or get flat out rejected at the SMTP negotiation process or relay attempt.
But things like icloud, office365, google workspace and similar are "too big to fail", right? They don't have to play by the same rules as the rest of us peons.
as referenced here, from the post on the 'mailop' mailing list
This is either an astonishing level of technical fuck-up from what has to be an entire work group of people with six figure salaries whose jobs are nothing but running email server infrastructure, so they must clearly know better, or a lack of regard for the internet community and accepted standards. I really cannot think of a third possible explanation for it.
To be clear for those people who don't run their own email servers: Having proper reverse DNS for the IP of your outbound SMTP sending server is one of the absolute bare minimum requirements for accepted mail flow, and is a standard that's probably 25 years old or older now. It significantly pre-dates SPF, DKIM, DMARC and all the rest. Proper RDNS is literally one of the first things you verify before you set up everything else.