Protect Your Business Email from Fraud, Phishing & Compromise
Expert guides to detect invoice fraud, stop BEC attacks, and harden Microsoft 365 email before attackers strike.
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Email Security Guides
Real-world email attacks are happening right now. Our guides show you exactly how to find and fix the vulnerabilities in your Microsoft 365 tenant.
How to Stop Invoice Fraud Emails in Microsoft 365: Detection & Prevention
Invoice fraud is the most common email attack on small businesses. Learn the three signs that an email is fake and how to block these attacks before they cost you.
Business Email Compromise (BEC) Prevention: Complete Guide for Microsoft 365
BEC attacks impersonate your executives to redirect wire transfers. This guide explains how they work and the three controls that stop them cold.
Microsoft 365 Email Security Checklist: Setup in 72 Hours
Your insurance carrier is asking for proof of email security. This checklist covers the 12 settings you need to harden M365 email and pass the audit.
Email Forwarding Attack: How to Find & Remove Hidden Rules in Microsoft 365
Attackers use hidden email rules to steal messages before you see them. This guide shows you how to spot these rules and lock down forwarding rules permanently.
Is Your Email Compromised? M365 Diagnostics Guide for Business Owners
Suspicious activity in your mailbox? Learn the 5 questions to ask and where to look in Microsoft 365 to confirm if an account has been compromised.
Case Study: How a 150-Person Tech Company Prevented $400K in BEC Losses
See how one company identified a sophisticated BEC attack in progress and blocked the wire transfer. The timeline, the signs they spotted, and the controls that worked.
About EmailShield365
Email is your highest-value attack surface. One compromised mailbox or successful wire fraud can cost your business tens of thousands of dollars.
Most M365 tenants ship with default email security settings that don't meet insurance requirements or stop sophisticated attacks. EmailShield365 exists to close that gap with clear, actionable guides that help you understand the risks and fix them fast.
Every article on this site is grounded in real attacks we've seen, and every recommendation is backed by security baselines that have been battle-tested in enterprise environments.
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Our experts will assess your Microsoft 365 email security in 24 hours and deploy hardened baselines in 72 hours. One-time cost. Full audit trail. No ongoing contract.
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