Phishing and impersonation are still the #1 threats for SMEs. Here’s a 2026 guide to email security, practical defences, and user training.
Email Security for SMEs: Stopping Phishing and Impersonation in 2026
Despite all the new tools and platforms, email remains the #1 attack vector for UK SMEs—especially in London and Manchester. Phishing, CEO fraud, and business email compromise (BEC) are just as common in 2026 as ever.
This guide covers what practical email security looks like today, what’s changed, and how to protect your business.
Amazing Support is a multi-award winning, Microsoft Partner and Cyber Essentials certified provider supporting SMEs across London, Greater London and Manchester.
1) Layered filtering is non-negotiable
Modern email security requires more than basic spam filters:
- phishing detection (lookalike domains, language analysis)
- malware/attachment scanning
- safe links rewriting
- real-time threat intelligence
If you’re only using the default filters, you’re exposed.
2) DMARC, DKIM, and SPF: the “email authentication” trio
These records help prevent spoofing and impersonation:
- SPF: identifies which servers can send mail for your domain
- DKIM: cryptographically signs messages
- DMARC: tells receiving servers what to do if a message fails checks
A good IT partner will configure and monitor these for you.
3) User training: your last line of defence
Even with the best tools, users are still targeted.
- Run regular phishing simulations (at least twice a year)
- Provide short, practical awareness training
- Make it easy to report suspicious emails (one-click “Report Phish”)
4) Impersonation protection and “CEO fraud”
Attackers often target finance staff or directors with lookalike domains or urgent requests.
- Use display name and domain similarity detection
- Warn users about “urgent payment” requests
- Lock down external forwarding and auto-forwarding rules
5) Incident response: what if someone clicks?
- Have a process for isolating affected devices/accounts
- Reset credentials quickly
- Communicate internally and externally as needed
- Review and improve controls after every incident
Quick FAQs
Is Microsoft 365 email secure enough by default?
It’s a good start, but most SMEs benefit from enhanced filtering and tighter controls.
How can we reduce phishing risk?
Layered filtering + authentication records + user training + clear response plan.
What’s the most common mistake?
Assuming “it won’t happen to us” or not testing users with real simulations.
