Error message: Blacklisted domain

Just recorded a short video on how to resolve Blacklisted domain problem on CyberPanel.

All you have to do is update your server host name so that you can create a domain.

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hello usmannasir, im having the same problem but is creating a subdomain name this domain is going to have alot of subdomains.
The only reason i changed the server name to domainname.com.gt is because im been having problems with sending email. now the email does not go to spam but when i check domainname.com.gt PTR records on DNS CHECKER i get the bellow results on the image.
before i was having this error the server had only the name of the domain but not the dot extensions .com.gt if i change the server back to just domain will the the emails work fine, or can you tell me hot to solve this two problems please.

image

Why i get the blacklisted error when i create a subdomain too. im trying to create a subdomain and is telling me that is blacklisted

Where to exactly find the source code to edit the file?