Is the mailserver domain. The one and only.
Did you follow the instructions here Achieve 10/10 Email score with CyberPanel!
You do not need to do anything extra beyond this. Just add your customer domains and setup mailserver as the primary mailserver domain or their own e.g. client.com will have mail.client.com or hey can use mail.primaryhost.com (I prefer this - no mail certificate issues) however both work perfectly with CyberPanel.
Solution to your problem
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Issue mailserver ssl to mail.lonesock.pro and no other domain whatsoever.
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Ask your customer to use mail.utsab.tv or mail.lonesock.pro
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Your cf records are ok dont touch them.
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To onboard new customers - create website make sure to tick mail domain checkbox then create email adresses and that is it.