Description:
Verifies that Direct Send is rejected in Exchange Online. Direct Send lets on-premises applications, printers and other devices deliver mail to the tenant's hosted mailboxes over SMTP without authenticating. The check is compliant when the organization's RejectDirectSend setting is enabled.
Why:
Direct Send allows internal applications and devices to send email using an SMTP relay through Exchange Online without authenticating. Rejecting Direct Send prevents unauthorized or misconfigured devices from sending emails through your Exchange Online environment, reducing the risk of spoofing and unauthorized mail flow.
Configured: Feature is in place.
Not Configured: Feature is not in place.
Scoring: Contributes up to 1 point to the Posture Recommendations score.
Category: Exchange
Microsoft Licensing: Works with Basic licensing
Remediation in Augmentt: Configure directly in Augmentt (Configure tab)
Compliance Frameworks:
NIST CSF 2.0 — PR.DS-02
CIS Microsoft 365 Benchmark v6 (Level 2) — 6.5.5
CIS Microsoft 365 Benchmark v7 (Level 2) — 6.5.5
HIPAA Security Rule — 164.312(e)(2)(i)
CMMC Level 1 — SC.L1-b.1.x
CMMC Level 2 — SC.L2-3.13.1
Microsoft documentation: