Forum Discussion
Disable Direct Send in Exchange Online to Mitigate Ongoing Phishing Threats
Direct Send allows devices and applications to send unauthenticated emails over port 25 directly to Exchange Online. While this may support legacy devices like printers or scanners, it also opens the...
Configure devices and apps to send email via SMTP with authentication, which is more secure. Use dedicated connectors with IP restrictions or certificates to control email flow securely.