Users on several domains connect the the mailserver cluster. The cluster consists of 3 servers.
These servers are combined with MX records behind securemail.hostdomain.com with their respective priority.
Clients see the email server as mail.theirdomain.com, which is cnamed to securemail.hostdomain.com.
I will setup hostdomain.com with a wildcard SSL certificate.
The problem that this serves is that a client can not use SSL over their mail.theirdomain.com.
Should i be using a multidomain SSL certificate or and what kind of ssl certificate should i use?