Domain name changed to worksyncpro.helioho.st. Also, if you want to still add worksync.helioho.st, a staff member can set that as an addon domain for you.
We traditionally don't whitelist certain IPs, so if you have a service connecting over FTP from an Azure server, as long as it uses the correct credentials, it shouldn't get blocked.
This is something an administrator can do, but mail quotas are changed on a case by case basis. I'll escalate your thread so an administrator can comment.
Domain added, it'll take effect in about ten minutes. I believe we automatically generate a "www" prefix, but you can create a redirect using an Apache config to redirect to the main domain.