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Microsoft 365 mail hardening

Exchange Online configuration choices such as Direct Send, RejectDirectSend, inbound connectors and filtering exceptions.

Current clusters

security1 distinct publisher

Blank envelope senders carry spoofed internal phishing past Exchange Online's RejectDirectSend

ReliaQuest's tests show Exchange Online accepts unauthenticated mail when the visible From header matches the tenant domain and the SMTP envelope sender is left empty. Forty percent of those messages went to senior leaders.

Publishers:scworld.com

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Evidence48
Adoption42
Hype gap+10
Incentives65

Confidence45

Microsoft 365 mail hardening — Clarity Today