Outlook android app keeps asking for password over and over again

Is there no way in which each virtual server email can use its own SSL in Virutalmin?

for example, the Outlook app automatically tries to insert incoming and outgoing mail server as mail.clientsdomain.com

In cpanel, you can choose to use your own domain … mail.clientdomain.com for incoming and outgoing mail server and it uses the SSL for client domain in the email certs. Why cant virtualmin do this?