I'm setting up a help desk ticketing system that's cloud hosted, and I'd like to give it access to my LDAP server so that users can login to the help desk with their familiar passwords. I want to use SSL for security. I have a mail server/DC that has an SSL cert and public IP, and I'd like to know if I just open port 636 through my firewall and use the mail server's URL (mail.domain.com) would that work? Any suggestions are appreciated.