I generate my own certificates from the certificate authority installed on the domain controller but this won't work for external clients that do not trust your internal certificate authority as a valid signer. You can purchase an SSL certificate from godaddy with multiple subdomains, i.e. company.com,
www.company.com, mail.company.com and that will handle 2/3 of the scenarios you posted above. As far as I know you cannot purchase an SSL certificate for an IP address... but I would also assume the only people that would navigate to an IP address would be your technical staff anyway? I can't imagine normal users memorizing an IP.
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