Which certificate to order for mail servers?

Welcome. I am confused.... Want to buy a Comodo PositiveSSL for mail servers. He mail server has the address mail.site.ru
What certificate to buy to protect 2nd or 3rd level?
Thank you.
July 2nd 19 at 18:01
2 answers
July 2nd 19 at 18:03
For the mail server like how you use the server certificate. The same issued for https. The certificate must be ordered on the domain name of your server. In your case it will be mail.site.ru
Which mail server are you using?
Kerio connect - sebastian.Volkman commented on July 2nd 19 at 18:06
July 2nd 19 at 18:05
Comodo PositiveSSL fit, order by domain mail.site.ru (without the www)

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