I'll be deploying a new email gateway named “smail.domain.com”. It will be accessible from 3 different public IPs. So, MX records will list smail, smail2, and smail3 in descending preference. I would like to deploy it with an SSL cert for all 3 names, but I am fairly certain that you cannot deploy a host with 3 SSL certs. My thought is to use a wild-card SSL cert, but will this even work? All advice is appreciated.
As well, for a host handling TLS, HTTPS, and SMIME, are there any particulars I need for the cert?