What type of certificate do i need for Exchange?

Hi, i rented a VPS from a companyand installed MiaB and i must say it is very nice project. I own a few servers and always was a bit scared of mail, because it is so damn complicated.
Anyway the mail server works a treat but i cannot get Microsoft exchange to do its magic, can someone maybe explain additional steps to get it to work?
I tried to add the account on the Mail app in W10 but it gives a error saying that the security policy is not met. What kind of certificate do i need to buy to dont have to deal with this type of errors on Exchange and IMAP?

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