lagrot

Hi! I have a certificate question. I have an Exchange 2007 server with a selfsigned cert. Now i want to secure it with a 3rd party certificate. I wonder what domain names I need to buy the certificate for? Do I need a third party certificate for the internal name? (mailserver.domain.local) or just for the external stuff, like: mail.domain.com webmail.domain.com I have several mail domains on the same server do I need certificate for them all? mail.domain2.com webmail.domain2.com Or just the "main" mail domain? /Lagrot