I have a few VPSes and domains, and tried to set up email on one of them recently.
Jumped through every hoop, got rDNS, SPF, DMARC, and DKIM all configured correctly...only to find out that the major email providers (at least Google and Microsoft, which account for a depressingly large fraction of email accounts) have decided that the VPS provider doesn't meet their standards, and either auto-block or mark as spam anything I send.
So I'm left with the choice of trying to migrate my entire VPS to a different provider—after figuring out which one, if any, Google and Microsoft actually deign to bless as being worthy of sending email to them—or not host my own email.
The email standard never specified or guaranteed access to the majority of inboxes (or any inboxes in fact). It's literally just a technical standard to conform to or not. Successfully transmitting emails to another inbox is completely orthogonal and based on the personal, or corporate, decisions of the sender, receiver, and anyone else in the chain.
There is no provision for a fair shake, special categories for new entrants, or anything similar.
What value is an open standard if it can only be useful if you use an implementation from a large corporation. It’s a basic fact that email is only useful if your intended recipient can receive your message. If corporate gatekeepers are restricting valid usage outside of their walls, then it ceases to be an open standard. It’s like the difference between source available and open source.
Jumped through every hoop, got rDNS, SPF, DMARC, and DKIM all configured correctly...only to find out that the major email providers (at least Google and Microsoft, which account for a depressingly large fraction of email accounts) have decided that the VPS provider doesn't meet their standards, and either auto-block or mark as spam anything I send.
So I'm left with the choice of trying to migrate my entire VPS to a different provider—after figuring out which one, if any, Google and Microsoft actually deign to bless as being worthy of sending email to them—or not host my own email.