Hello!

The method to compare PTR & MX to domain name is wrong, because it could be correct but different one and aaPanel shows "Not Set".
For example I have two domains: D1.com & D2.com

D1.com with Mail Server = mail.D1.com

D2.com uses the same MX and PRT records as D1.com

aaPanel Don't understand it:

In real check all works by mail-tester:

in /etc/postfix/main.cf myhostname = mail.D1.com

    Hello, I suggest you click Refresh Domain in the upper right corner. Is it normal?
    If you have set it up correctly you can ignore it.

    7ender