Phishing and impersonation attacks remain one of the biggest cyber threats facing UK organisations. With AI-generated emails, deepfake impersonation, and increasingly convincing social engineering, these attacks are more sophisticated and harder to detect than ever before. To stay secure, organisations need a layered, modern approach to email and identity protection.
1. Strengthen email authentication
Attackers often attempt to spoof legitimate domains to fool employees into believing their emails are trustworthy. Implementing email authentication protocols helps prevent spoofing and impersonation attempts.
- SPF – Specifies which mail servers are authorised to send on your domain’s behalf.
- DKIM – Cryptographically signs your emails to prove they haven’t been tampered with.
- DMARC – Instructs receiving servers how to handle messages that fail SPF/DKIM checks, helping block fraudulent emails entirely.
These three controls are essential for protecting both your organisation and your customers from impersonation attacks.
2. Deploy layered email filtering
Traditional spam filters are no longer effective against modern phishing. Advanced email security platforms should analyse attachment safety, rewriting malicious links, scanning language patterns and checking sender authenticity using real-time threat intelligence.
- Attachment sandboxing
- URL protection and safe link rewriting
- Suspicious language and domain analysis
- AI-based phishing detection
Layered filtering helps catch complex phishing attempts that would otherwise reach users.
3. Train employees to recognise phishing attempts
Even with strong technical controls, employees remain a primary target. Cybercriminals impersonate senior leaders, suppliers or government bodies, creating a sense of urgency to trick users into clicking or divulging information.
Best practices include:
- Regular phishing simulations
- Bite-sized training for all employees
- Clear reporting processes for suspicious emails
- Warnings for “urgent payment” or “account update” requests
A well-trained workforce is one of the strongest defences against social engineering.
4. Prepare for AI‑driven impersonation attacks
AI has transformed phishing. Attackers are now using AI to generate highly personalised emails, create deepfake audio messages, and imitate writing styles based on publicly available data. This makes phishing more believable than ever.
Organisations should proactively defend against AI‑powered threats by:
- Using tools that detect lookalike domains and impersonation patterns
- Enforcing multi-step approval processes for financial requests
- Restricting external auto-forwarding rules
- Implementing stricter controls for high-risk roles like Finance, HR and senior leadership
5. Implement strong identity security
Many phishing attacks succeed because attackers gain access to legitimate accounts. Identity protection is now central to phishing defence.
- MFA everywhere – Prevents access even if credentials are stolen
- Conditional Access – Blocks risky login locations or devices
- Zero Trust principles – Never assume trust based on location or network
- Passwordless authentication – Reduces credential theft risk
Identity security reduces the impact of both external attacks and compromised internal accounts.
6. Have a clear incident response plan
Even with robust defences, some phishing attempts will inevitably succeed. Having a well-defined incident response process minimises damage and enables fast recovery.
Your plan should include:
- Immediate steps to isolate compromised accounts or devices
- A rapid credential reset process
- Mailbox rule checks for malicious forwarding
- A communication plan for internal teams
- A post‑incident review to strengthen future defences
Fast, structured response significantly reduces financial and operational impact.
How Wavenet helps organisations stay protected
Phishing and impersonation attacks are becoming more advanced every year - but your protection doesn’t need to fall behind. As the UK’s most trusted managed service and security provider, we help organisations strengthen their defences with a complete, modern approach to email and identity security.
We support businesses with:
- Advanced email filtering and impersonation protection
- SPF, DKIM and DMARC configuration and monitoring
- Identity protection including MFA, Conditional Access and Zero Trust
- Microsoft 365 security hardening and tenant governance
- 24/7 SOC monitoring and rapid incident response
- Staff awareness training and phishing simulations
Whether you need to improve your current defences, reduce risk across Microsoft 365, or create a fully managed security strategy, we are here to help.
