People/publishers/partners requesting access to any of our systems must have a privately owned, secure email domain.

AdOps will not grant access to gmail addresses or any other publicly-domained email addresses, as they are not as secure as a private domain. XM represents clients with sensitive information and require a certain level of security when it comes to who can access data and how, which requires Crossmedia to have some overarching security measures in place when it comes to access.
This is one of those security measures.