I am using Icewarp’s feature to request a ceritificate from Let’s Encrypt.
My domain requested in the cert is: imap.mark-roberts.com
My hosting provider, if applicable, is: bluehost, imap subdomain redirects to 12.29.12.91 which is where our email server is hosted. Port 80 is open.
Welcome to the Let’s Encrypt Community 
Thank you for supplying the information you have. There is probably additional detail available for the error you received. Can you post the full response, if there’s more.
edit: I looked at the Icewarp logs and I found the error:
ACME Exception: Error requesting challenges 403 urn:acme:error:unauthorized Error creating new authz :: Validations for new domains are disabled in the VI API
There was a link (below) in the error. I'm currently searching for a solution for this.
Your ACME client is outdated. You need an ACMEv2 client. There are a number of choices, including by own (Open ACME), though it is currently being updated.
Thank you.
I am using the feature built in IceWarp to request a certificate. I have contacted their support on how to update the ACME client.
Sounds like a good idea. Are you limited to their offering?
I could manually import a certificate. I will look into the documentation on how to do it with Let’s Ecrypt with certbot on manual mode on windows.
Perhaps:
certbot certonly --manual -d domain.com,www.domain.com,... --preferred-challenges dns --dry-run
The --dry-run is purely for testing your process.
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