The Biggest Email Security Mistakes Businesses Still Make
Email remains the number one way cyber criminals gain access to businesses. Despite advances in security technology, Microsoft 365 protections, and growing awareness of cyber threats, many organisations are still making the same mistakes they were making five years ago.
The surprising part? Most successful email attacks don't rely on sophisticated hacking techniques. They rely on human behaviour, poor processes, and overlooked security settings.
Here are some of the biggest email security mistakes businesses continue to make and what can be done to avoid them.
Assuming Microsoft 365 Does Everything
One of the most common misconceptions is that moving to Microsoft 365 automatically solves email security.
Microsoft invests billions into security, and the platform includes excellent protections. However, those tools still need to be configured, monitored, and managed correctly.
Many businesses are surprised to discover that features such as multi-factor authentication, conditional access policies, advanced threat protection, and email authentication aren't fully configured out of the box.
Microsoft provides the tools. Businesses still need a strategy for using them effectively.
Not Enforcing Multi-Factor Authentication
It is remarkable how many organisations still allow users to access business email accounts using only a password.
Passwords are stolen every day through phishing campaigns, data breaches, and social engineering attacks.
Without multi-factor authentication (MFA), a compromised password can give an attacker immediate access to emails, contacts, files, Teams conversations, and sensitive company information.
MFA is one of the simplest and most effective security measures available, yet many businesses still haven't enforced it across every user account.
Treating Security Awareness Training as a One-Off Exercise
Many organisations provide cybersecurity training when an employee joins and never revisit the topic.
The problem is that cyber threats evolve constantly.
Today's phishing emails are often highly personalised, professionally written, and incredibly convincing. In many cases they look more legitimate than genuine business communications.
Security awareness should be an ongoing process rather than an annual box-ticking exercise.
Regular phishing simulations, refresher training, and security updates help keep cybersecurity at the forefront of employees' minds.
Trusting Display Names Instead of Email Addresses
Cyber criminals understand that people are busy.
One common tactic is to impersonate directors, suppliers, customers, or trusted partners using familiar names and branding.
An email may appear to come from "John Smith - Finance Director", but the actual email address tells a very different story.
Employees should be trained to verify email addresses before acting on requests involving payments, password resets, sensitive information, or urgent changes.
The display name might be trusted.
The email address is where the truth usually lives.
Ignoring Email Authentication Standards
Many businesses have never heard of:
SPF
DKIM
DMARC
Yet these three technologies play a critical role in preventing email spoofing.
Without proper email authentication, attackers can impersonate your domain and send fraudulent emails that appear to come from your business.
Not only can this damage trust with customers and suppliers, but it can also increase the likelihood of phishing attacks succeeding.
Implementing and monitoring these standards should be a core part of every organisation's email security strategy.
Many Businesses Still Don't Have DMARC Configured Properly
One of the most overlooked areas of email security is DMARC (Domain-based Message Authentication, Reporting and Conformance).
While the name sounds technical, the purpose is simple: it helps prevent cyber criminals from sending emails that appear to come from your business.
Without DMARC, attackers may be able to impersonate your domain and send fraudulent emails to customers, suppliers, or even your own employees. These emails can be used to request payments, steal credentials, or damage trust in your organisation.
DMARC works alongside SPF and DKIM to verify that emails claiming to come from your business are actually authorised to do so. When configured correctly, it gives receiving email servers clear instructions on how to handle suspicious messages, helping stop spoofed emails before they reach the inbox.
The challenge is that many businesses either haven't implemented DMARC at all or have it configured in monitoring mode only, meaning fraudulent emails may still be delivered.
As phishing attacks continue to evolve, DMARC is rapidly becoming a fundamental part of a modern email security strategy rather than an optional extra.
Giving Every User the Same Level of Access
Not every employee needs access to every system.
One compromised account should never provide unrestricted access across an entire organisation.
Unfortunately, many businesses operate with excessive permissions that have accumulated over time.
Applying the principle of least privilege helps reduce the impact of a compromised account and limits how far an attacker can move through a business.
Failing to Monitor for Suspicious Activity
Many organisations focus entirely on prevention and very little on detection.
The reality is that no security solution is perfect.
What matters is how quickly unusual activity is identified and addressed.
Examples include:
Logins from unexpected locations
Impossible travel events
Large-scale email forwarding rules
Multiple failed login attempts
Unusual mailbox activity
The earlier suspicious behaviour is identified, the easier it is to prevent a minor issue from becoming a major incident.
Not Having a Plan for Business Email Compromise
Business Email Compromise (BEC) attacks are among the most financially damaging cyber threats facing organisations today.
Rather than deploying malware, attackers simply gain access to legitimate email accounts and use trust to manipulate employees into making payments or sharing information.
Many businesses have no documented process for verifying payment requests, supplier bank changes, or sensitive instructions received by email.
A simple verification phone call can often prevent a costly mistake.
Assuming "It Won't Happen to Us"
Perhaps the biggest mistake of all.
Cyber criminals do not only target large corporations.
Small and medium-sized businesses are often viewed as easier targets because they typically have fewer resources dedicated to cybersecurity.
Attackers don't need to compromise thousands of organisations.
They only need one employee to click one convincing email.
Email Security Is a Business Issue, Not Just an IT Issue
Email security is no longer purely a technical challenge.
It affects operations, finances, reputation, customer trust, and business continuity.
The organisations that are most successful at defending against email threats combine technology, processes, and user awareness into a single security strategy.
The good news is that many of the most effective improvements are relatively straightforward to implement.
The challenge is knowing where the gaps are before an attacker finds them.
How Confident Are You in Your Email Security?
If a member of staff clicked a convincing phishing email tomorrow, would your current security controls stop the attack?
If someone attempted to impersonate your business and send fraudulent emails to your customers, would you know?
If a cyber criminal gained access to a Microsoft 365 account, how quickly would it be detected?
Most businesses assume they're protected. Very few have actually tested their assumptions.
At Sunrise Technologies, we help organisations uncover hidden risks across Microsoft 365, email security, user access, cybersecurity controls, and business processes.
Whether you're concerned about phishing attacks, email impersonation, account compromise, or simply want reassurance that your current setup is doing what you think it is, we're here to help.
Contact our team today for a no-obligation conversation about your IT security and discover where your biggest risks really are before someone else does.