Our domain name servers are at Cloudflare because our web design company requires it, but this has interfered with mail delivery to some domains from our on-premises mail server that sends directly to the internet. The error says we have no PTR record so it refuses to accept the mail from us. The Cloudflare support docs explain what reverse DNS is but then the support doc at https://support.cloudflare.com/hc/en-us/articles/360019093151-Managing-DNS-records-in-Cloudflare says:
The main reason to have a PTR record is to prevent emails from ending up in spam folders. Since Cloudflare doesn’t support email traffic by default, you would instead need to set the PTR record where your email server is located. Please reach out to your email provider for assistance.
The PTR record option shown in the DNS Records dropdown is not for adding PTR records for Reverse DNS resolution. It is instead for adding a PTR Record to the Forward DNS resolution for the domain. …
We have no “email provider” other than ourselves so we cannot ask anyone else to set up a PTR record. Must we cancel our Cloudflare account and reclaim control of our DNS or is there a way around this problem?