#Mail Flow Rules

2 guides

Cover showing the Exchange admin center mail flow rule builder with conditions, actions, and exceptions

How to Create Mail Flow Rules in Exchange Online

Create mail flow rules (transport rules) in Exchange Online: add disclaimers, route mail, block attachments, and warn on external senders, with EAC and PowerShell steps.

MCSA Guru Team Sep 30, 2026 7 min read

Diagram-style cover showing external email auto-forwarding being blocked by a Microsoft 365 outbound spam policy

Microsoft 365 & Exchange

How to Stop Users from Auto-Forwarding Emails Outside the Company

Stop Microsoft 365 users from auto-forwarding email outside your company. Use the outbound spam policy, anti-phishing, and mail flow rules to block external forwarding.

MCSA Guru Team Jun 24, 2026 8 min read