Determine the Office 365 Host Name.
The Office 365 hostname is required so that mail from The Packet Hub can be correctly delivered to Office 365.
In order to determine the hostname, follow these steps:
1.1 Login to the Office 365 Admin Center.
1.2 Select 'Setup' from the menu on the left and then 'Domain'
2.1 Select your domain that you wish to configure.
3.1 The domain settings will be displayed. Take note of the MX value, this is the hostname.