You can change the default DNS entry of Webmail?

Hello,

You would need to remove the webmail proxy subdomain entirely and then hard-code the subdomain in the WHM > Edit Zone Templates file. Simply because the entry doesn't exist in that file doesn't mean you cannot create a hard-coded entry. The issue here is that the existing entries stem from having enabled WHM > Tweak Settings > Proxy subdomain creation:

To remove the existing proxy subdomains, you would use:

Code:

/scripts/proxydomains remove --subdomain=webmail

Then you would need to hard-code the webmail CNAME into the WHM > Edit Zone Templates files and manually add the entry into any already existing zones.

In all actuality, you should simply remove the Proxy Subdomains entirely and hard code all 4 of them in the zone template, because any new domains will try to create that webmail entry due to having enabled that option. If you want to remove all 4 of them entirely, you'd run:

Code:

/scripts/proxydomains remove

Then hard-code the 4 proxy subdomains you want with the CNAME for the webmail one, and uncheck the Tweak Setting.