I saw this feature in other mail server software (MS Exchange), and i think this would be wonderful if AMS had such a feature.
Right now, you can select only 1 SSL certificate for any service at a time. It would be nice to assign a cert for each domain.
So if you have mail.mydomain.com, mail.fredsdomain.com, mx.marysdomain.com you can have an SSL cert for each that will load when requested. Since SSL certs are not tied to IP addresses, but domain names, this shouldn't be too terribly hard to do and would be a HUGE improvement.