I have a mail-server running and I want to buy a SSL-Certificate as they are pretty cheap now. I use mail.domain.com as reverse-DNS, POP3 and SMTP clients use mail.domain.com (some use pop3.domain.com and smtp.domain.com) for sending and receiving e-mails. The SSL-Submission asks me for a domain - is it mail.domain.com or domain.com as I do not have a Wildcard-SSL? I just want to use it for Mail.
Or is it possible to use it for both by using domain.com? (Apache and Postfix/Courier on the same server and IP)