Cant setup emails in cyberpanel for my domain

hey i want to setup email in cyber panel but when I try to send email it doesn’t work out . I try initial setup option for setting up mail configuration i get following error.

Domain that you have provided is not configured as rDNS for your server IP. [404]

plz guide me how can i set them up properly.

what are the results of //email/testTo:

seems mail domain ssl is not mapped can you see if mail.domian.com has the SSL?