Best practice these days is to prepend inbound external emails with a banner notifying recipients the email originated from outside the organization. This gives recipients a quick and easy way to identify domain spoofed emails, and is often the cornerstone of internal Phish Identification Training.
Whitelisting in 365, while well documented by KB4, can be a moving target. DMI solves those whitelisting headaches by bypassing all transport rules and 365 security controls.
However, DMI lacks the ability to prepend HTML or even plain text to these messages. Without this feature DMI is useless to any organization training its users to look for a prepended external email banner.
Can you please add a feature that allows HTML to be prepended to all mail delivered via DMI?
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