How to create a cert for CommuniGatePro email server

[Bruce5051]

@Docfxit

I don't have a web server. I have an email server.

Hi @Docfxit,

The consider using the DNS-01 challenge
Here is a list of DNS providers who easily integrate with Let's Encrypt DNS validation

Edit but it looks like you are already doing that.
So why keep stating the

@Docfxit

web server

is an issue?

@Docfxit

 7: [dns] Create verification records on DigitalOcean
 8: [dns] Create verification records with acme-dns (https://github.com/joohoi/acme-dns)
 9: [dns] Create verification records with your own script
 10: [tls-alpn] Answer TLS verification request from win-acme
 C: Abort

 How would you like prove ownership for the domain(s)?: 7