I am about to start offering a premium service on my SAAS product.
At the moment my users have http://www.mydomain.com/groups/groupname/
I have it working so that they can add a CNAME record on www.theirdomain.com which masks to mydomain.com
This all works fine.
My question is, should I be asking my users to add "mydomain.com" as the destination for the CNAME record, or should I be trying to spread these at my end and use "external.mydomain.com" or "cname.mydomain.com"
I'm thinking on a separate record, I could then change what it points to (e.g. an additional server if needed?)
(Also then, if I did tell them to point to "external.mydomain.com" should that record it's self be a CNAME to mydomain.com OR an A record to the IP address of my server?)