Microsoft's Anti-Spam Policy uses the allow lists for exceptions. If you are assigned a role with administrative privileges, you can whitelist Digify by adding digify.com to the "allow lists".
You can set an allow list when you add or edit Anti-Spam policies that apply to specific recipients in your organization.
To add or edit a Spam Filter policy
Go to https://outlook.office365.com/ecp/ and sign in with the Microsoft account with admin rights.
In the left navigation, under Protection > Spam Filter.
Under the Spam Filter section, choose New (the New button resembles a plus sign “+”) to create a new policy. (Alternatively, you can edit an existing policy.)
Specify a name and description for your policy.
In the Allow lists section, under Domain allow list, select the plus sign "+", and then type Digify’s domain ( digify.com ) and then hit the Okay button.
In the Applied To section, choose The recipient is a member of, and then choose the group(s) you want to include in your policy. Choose Add, and then choose OK.
When you are finished editing the policy, in the lower right corner of the screen, choose Save.