Does Mirapoint support per-domain SSL certificates?
SSL certificates are associated with IP addresses, and you can add a certificate for every IP address associated with the appliance.
For all appliances, Mirapoint supports up to 51 IP addresses for the physical interface through 3 network ports, each of which can have 1 primary address and 16 aliases. It is possible to have up to 48 certificates on the appliance.
Additionally, if you create distinct DNS A records for mail.a.com, mail.b.com, and mail.c.com and so on, and use IP aliases for each of these addresses, you can achieve per-domain certificates. But it is not possible to do this for thousands of domains.