Emails are not delivering

I am new here , and i added 3 domains, none of them is sending emails, they told me that the problem is with that i dont have proper IPv6 PTR record , how can i fix that ?

Hello there, for the email delivery to function, you need MX records set. Please check if you have them in the DNS record. Cloudflare can not set a PTR record for your domain. This should be done through your hosting IP provider. For proxied domains, Cloudflare responds to DNS queries with its own shared, dynamic IP addresses. Therefore, PTR records cannot be added to Cloudflare. Here are the few views:

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