When creating a new virtual server, Virtualmin Pro creates an MX record in the format of "mail.clientdomain.tld" which we believe is a problem.
In the modern world, many/most mail servers will not accept mail from another mail server without doing a reverse DNS lookup on the IP address. This means you have to have a proper reverse pointer record for your IP address...usually configured by your ISP (IP provider).
Ultimately, this means that all domains with mail being hosted on this server must have the same (our) MX record, not "mail.clientdomain.tld".
The secondary MX records are being created correctly.
I See in the "Edit Server Template -> BIND DNS records for new domain" section where new records can be added, but I don't see how to change the default behavior.
How do I configure Virtualmin to create "mail.hosterdomain.com" MX records for each new virtual server instead of "mail.clientdomain.tld"?