Email Security Best Practices Every Business Must Follow in 2025
Email is the number one vector for business cyberattacks. Phishing, business email compromise, and ransomware all start in the inbox. Here is how to protect your organisation without disrupting productivity.
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Why Email Is the Primary Attack Surface
Over 90% of cyberattacks begin with a phishing email. Business Email Compromise (BEC) cost businesses globally over $50 billion between 2013 and 2023. Treating email security as an IT problem rather than a business risk problem is the single most dangerous mistake.
Configure SPF, DKIM, and DMARC
These three DNS-based email authentication standards dramatically reduce the risk of your domain being used to send phishing emails. Businesses with a DMARC reject policy see email-based fraud attempts targeting their customers drop by over 95%.
Enforce Multi-Factor Authentication
A compromised password is the most common account takeover vector. MFA blocks over 99.9% of automated credential-stuffing attacks. Enforce MFA for all users in your email admin console, not just executives.
Train Staff to Recognise Phishing
Technical controls catch automated attacks; trained humans catch sophisticated targeted attacks that bypass filters. Run simulated phishing campaigns monthly — organisations running regular phishing simulations reduce click rates from 30%+ to under 5% within 12 months.
Email Gateway and Advanced Threat Protection
Google Workspace Advanced Protection and Microsoft Defender for Office 365 provide sandboxed attachment scanning, real-time link rewriting, and AI-powered phishing detection that catches attacks which bypass standard spam filters.
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