GeoTrust, RapidSSL, and Comodo certificates all cover both www and non-www automatically if the certificate is generated using www. For example, if you generate a GeoTrust, RapidSSL, or Comodo certificate for www.domain.com, then domain.com will automatically be covered as well. Symantec and Thawte certificates do not automatically cover both www and non-www, but they are all multi-domain compatible. So, you or your customer just needs to purchase an additional domain in order to cover both www and non-www.
No, the common name (or domain name) cannot be changed on a purchased SSL certificate. If you need to change the common name that the SSL certificate has been issued to, you will need to cancel the certificate and reorder with the correct common name.
Yes, a basic DV certificate will work on a mail server. We do have certain certificates available, like the Comodo UC Certificate, that have been designed to work exclusively within an Exchange environment and may be more compatible – but a basic DV certificate will also work.
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