I have my mx record on my domain registrar set up like this Code: MX @ mail.domain.ca. (Priority: 10) when I go to the domain mail.domain.ca it brings me to the default nginx page. I never set this up but is it possible to create a site through ISPConfig panel that uses this mail.domain.ca domain that could essentially redirect to me mail login page? or create a site using this domain so its little more professional besides the basic nginx page. or will any use of the mail.domain.ca domain change my mailing server or affect is.
It should not, unless it creates a cert and breaks something with the certificate for your email server, but I don't think it will happen.