Understanding SSL

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http://serverfault.com – Trying to understand how SSL certificates work. Is the following correct: I have a website at www.example.com and a mailserver at mail.example.com. The website is public and visited by many people. The mailserver is only for a small group of people all of whom I know. I would like to add SSL to both the web and the mail server. As far as I understand, unless I buy a wildcard certificate, the certificate would only be valid for either www.example.com or mail.example.com, correct? I'd get a payed for SSL certificate from a reliable company and all my visitors to the web site would be happy. T (HowTos)