The quick answer: Standard business email is not secure by default. Without additional measures such as spam filtering, anti phishing tools, DMARC configuration, and MFA, your inbox is vulnerable to phishing, spoofing, and business email compromise (BEC). 38% of UK businesses reported a phishing attack last year. A layered approach combining technical controls and staff training is the minimum standard for any business handling client or financial data.



(Full detail on each of these below — skip to whichever section is relevant to you.)

Are emails secure?

Standard business email is not inherently secure and a password alone is not a security strategy.

The protocols that underpin business email were not designed with modern cyber threats in mind. Emails are transmitted in plain text by default, with no encryption unless specific measures are in place. Without additional security measures, business emails are vulnerable to interception, spoofing, and phishing attacks, often without the sender or recipient ever knowing.

Standard inboxes offer no protection against sophisticated phishing campaigns or business email compromise attacks.

Why is email the most common entry point for cyber attacks?

Email is the most common attack vector because it exploits human behaviour rather than technical vulnerabilities, making it significantly harder to defend against with technology alone.

According to the UK Government's Cyber Security Breaches Survey, 38% of businesses reported a phishing attack in the past year, making it the most prevalent form of cyber attack on UK organisations.

Attackers target email because it is direct, personal, and bypasses many technical defences. Even experienced, capable employees are vulnerable to well crafted phishing attempts. The most sophisticated attacks are designed to be indistinguishable from legitimate correspondence.

What is business email compromise and why is it a growing threat?

Business email compromise (BEC) is when an attacker impersonates a legitimate email address to trick staff into transferring funds or sharing sensitive data, bypassing technical controls entirely.

A common scenario: a finance team receives what appears to be a payment instruction change from a director or trusted supplier. The email looks genuine. The request appears routine. The transfer is made, and by the time the fraud is identified, the funds are gone.

BEC is particularly dangerous because it exploits trust and authority rather than technology. Even businesses with strong technical defences are vulnerable if their staff haven't been trained to recognise it.

What email security measures should every business have in place?

Every business should have four foundational controls in place: spam filtering, anti-phishing tools, DMARC/DKIM/SPF configuration, and MFA on all email accounts.

Spam filtering: blocks malicious or suspicious emails before they reach the inbox

Anti phishing tools: detects and quarantines phishing attempts, including sophisticated spear phishing attacks

DMARC, DKIM and SPF configuration: three authentication protocols that prevent attackers from spoofing your domain and sending emails that appear to come from your business. Without these, your domain can be impersonated with relative ease

Multi Factor Authentication (MFA) on all email accounts: ensures a compromised password alone is not sufficient to access an inbox

For SMEs across the West Midlands, most of these measures can be implemented quickly and cost-effectively with the right IT partner in place.

Why staff awareness is as important as technical controls

Human error is the leading cause of email related breaches, and no amount of software fully compensates for an untrained employee.

Technical controls significantly reduce risk but cannot eliminate the human element. Staff awareness training builds the human firewall, an informed workforce that recognises threats and responds appropriately. Training should cover:

Recognising phishing emails, including spear phishing attempts from apparent known contacts

Verifying unexpected payment requests through a separate channel before acting

Understanding the risks of clicking links or opening attachments from unfamiliar sources

A single click from one employee can compromise an entire network. Regular staff awareness training is one of the most cost effective investments in cyber security available.

How does managed email security work in practice?

Managed email security means threats are caught automatically before they reach your inbox rather than relying on your team to spot them.

In practice: continuous monitoring of email traffic, automated filtering of malicious emails, real time alerts when suspicious activity is detected, and rapid response when a threat is identified.

At Vibrant Networks, our managed email security is powered by Hornetsecurity (one of Europe's leading cloud security platforms), providing advanced threat protection, email encryption, Microsoft 365 backup, and anti-phishing capabilities for businesses across the West Midlands.

The difference between managed email security and standard inbox protection is the difference between hoping your team spots a threat and having a system that catches it before they ever see it.

How Vibrant Networks can help

At Vibrant Networks, we work with SMEs across the West Midlands to secure their email systems, from implementing foundational controls to delivering fully managed email security through our Hornetsecurity partnership.

We offer a free, no obligation cyber security review for businesses across the West Midlands and beyond, acting as an honest assessment of where your email security stands and what needs to change.

Call 01922 612387 to arrange your free review, or explore our cyber security case studies to see how we have helped West Midlands businesses strengthen their defences.

Frequently Asked Questions

Are business emails secure by default? No. Standard business email is transmitted without encryption and has no built-in protection against phishing, spoofing, or business email compromise. Additional security measures (including DMARC configuration, anti phishing tools, and MFA) are required to make business email genuinely secure.

What is business email compromise? Business email compromise (BEC) is a cyber attack where an attacker impersonates a legitimate email address (typically a senior colleague, supplier or client) to trick employees into transferring funds or sharing sensitive data. It bypasses technical security controls by exploiting trust rather than technology.

What is DMARC and do I need it? DMARC is an email authentication protocol that works alongside DKIM and SPF to prevent attackers from spoofing your domain. Without it, your email address can be impersonated relatively easily. Most UK businesses should have DMARC configured as a baseline security measure.

How do I know if my business email has been compromised? Common signs include unexpected sent items, password reset emails you didn't request, colleagues receiving unusual emails from your address, or login alerts from unfamiliar locations. If you suspect a compromise, change your password immediately, enable MFA, and contact your IT provider.

Does Microsoft 365 include email security? Microsoft 365 includes basic spam filtering but does not provide comprehensive protection against sophisticated phishing, BEC, or zero day attacks out of the box. Additional protection (such as Hornetsecurity, which Vibrant Networks uses for clients across the West Midlands), provides a significantly stronger layer of security on top of Microsoft 365.