In order to complete setting up your vanity domain:
- Go to DNS settings in your domain registrar account
- Create a CNAME record for mail.<youdomain>.com
- Point CNAME above to http://subdomain.spheremail.co, otherwise HTTP requests for the vanity domain are not sent to SphereMail.co.
In GoDaddy there is a field named “Name” and you can just enter any name, such as “virtual” there.
Then there is another a field named “Points to” and just enter “yoursubdomain.spheremail.co” there.