A step-by-step guide to reducing risk, stopping email-based threats and securing Microsoft 365 with built-in and advanced configurations
Misconfigured or under-protected Microsoft Exchange Online
environments are a leading cause of data breaches and phishing attacks. As
organizations increasingly rely on cloud-based communication and collaboration,
securing Exchange Online has become a critical priority for IT teams and
managed service providers.
This best practices guide from the Acronis Threat Research
Unit (TRU) offers a clear, actionable roadmap for hardening Microsoft Exchange
Online against the most common threats. Whether you're managing a small
business environment or a complex enterprise deployment, this guide provides
step-by-step recommendations to enhance security and reduce risk.
Download this guide to learn how to
• Enable key security features such as external email
tagging and first-contact warnings.
• Block risky actions like auto-forwarding to external
domains.
• Secure shared mailboxes and prevent spoofing through
proper configuration.
• Implement advanced protection with Safe Links, Safe
Attachments and multifactor authentication.
• Understand which features are available in your current
Microsoft 365 plan.
With real-world PowerShell commands, licensing insights and
references to official Microsoft documentation, this guide empowers IT teams to
take immediate action — no guesswork required.
Download the TRU Best Practices Guide to enhancing Microsoft
Exchange Online security and start closing your configuration gaps today.