You can add a CAA record to your zone file at Gandi, if you are using our LiveDNS.
The standard syntax for SSL certificates purchased from Gandi will be like the following if you enter it in the text version of our form:
@ IN CAA 0 issue “comodoca.com”
After you have saved your version of the zone, remember to activate it for it to take effect.
You can also very well alow multiple Certification Authorities (CA) to issue certificates for your domain. For example:
@ IN CAA 0 issue “comodoca.com” @ IN CAA 0 issue “letsencrypt.org”