Change mail server address in mail client manual settings template

Hello, in our configuration we need change on shared hosting's servers Mail addres in "Email Accounts" -> "Set Up Mail Client" in Incoming and outgoin server for Secure SSL/TLS Settings's column instead of pattern: mail.DOMAIN.COM
pattern was available as the address, the main domain of the account. I also think that the same pattern will be used in autodiscovery feature In first case, I think we need to change /usr/local/cpanel/base/frontend/paper_lantern/mail/clientconf_manual_settings_include.html.tt
(source: ) but how does it look to always take the main domain? what should also be changed to make autodiscovery work the same? I will be grateful for the answer. Regards RM