I'd like to be able to white label crossbox under my reseller brand, and have that brand applicable to all sub-accounts. Would this be possible?
Yes, with a feature called branding profiles. Here is how it works.
The first step is to create an [email protected] e-mail address (replace domain.com with your actual domain name). If you already have it, then make sure you also have the password.
The next step is to log in with [email protected] to CrossBox.
In the side-navigation (drawer) navigate to Admin -> Branding and click the ADD fab button in the bottom-right corner.
IMPORTANT: Make sure that the domains listed in the Host and SMTP/IMAP/POP3 fields have either CNAME or A record pointing to the server.
After you click SAVE, CrossBox will check for a CNAME/A record, and if the check fails, you'll get an error message:
mail.example.io hosts do not have CNAME or A record for mail.example.io or 2184.108.40.206
Sometimes there may be a cached DNS response so you may want to wait before trying again, especially if you added the DNS record afterward.
After you save the branding profile, you'll be able to access the branded version by using Host for webmail and SMTP/IMAP/POP3 for other mail clients.