Firewalls, antivirus, backups and monitoring are all essential parts of modern cyber security. But there’s one critical area that often gets overlooked.

Your email domain.

In many cyber attacks, criminals don’t try to hack your systems directly. Instead, they impersonate your business by sending emails that appear to come from your domain. These attacks are known as email spoofing, and they are one of the most common starting points for phishing, invoice fraud and business email compromise.

Without the right protections in place, attackers can send messages that look like they came from your organisation, potentially damaging both your finances and your reputation.

What Can Happen If Your Domain Isn’t Protected?
When a domain isn’t properly secured, cybercriminals can exploit it in several ways. This can lead to:-

Fake invoices sent to customers
Directors or finance teams being impersonated
Malicious links or malware distributed in your name
Loss of trust with clients and suppliers

Many businesses assume their email provider automatically protects them from this type of attack. In reality, the protection comes from correctly configured domain authentication records.This is where the three pillars of email security come in.

The Three Pillars of Email Security

Proper email protection relies on three key technologies working together:

1. SPF (Sender Policy Framework)

SPF allows your domain to declare which systems are authorised to send email on its behalf. When a receiving mail server gets a message claiming to come from your domain, it checks your SPF record to confirm the sending server is allowed to do so. If the sender isn’t approved, the message can be flagged or rejected. Without SPF, it becomes far easier for attackers to pretend they are sending legitimate messages from your company.

2. DKIM (DomainKeys Identified Mail)

DKIM adds a digital signature to outgoing emails. This signature allows receiving servers to verify that the message hasn’t been altered in transit and that it genuinely came from your domain. It acts like a seal of authenticity for your emails, ensuring that what was sent is exactly what the recipient receives.

3. DMARC (Domain-based Message Authentication, Reporting & Conformance)

DMARC ties everything together. It tells receiving email systems what to do if SPF or DKIM checks fail. This could include:-

Monitoring suspicious messages
Quarantining them
Rejecting them entirely

DMARC also provides reporting, allowing organisations to see who is sending email on behalf of their domain and identify potential abuse.

Without DMARC, even if SPF and DKIM exist, attackers may still find ways to impersonate your domain.

Check Your Domain Security in Under 30 Seconds

To help businesses understand how exposed their domain might be, we’ve launched a free Quicksmart Domain Security Checker.

The tool analyses your domain’s email authentication settings and gives you a clear security score in under 30 seconds, highlighting whether your domain is properly protected against impersonation, phishing and spoofing attacks. Our checker reviews the key pillars of domain security and presents the results in plain English, so you can quickly see where improvements may be needed.

Key features include:

Free to use
Takes under 30 seconds
Plain-English results
Highlights potential email security gaps

You can try the tool here:

https://www.quicksmart-it.com/domain-checker

IT is often buried in acronyms and technical jargon, so we’ve done the hard work for you breaking it down so you can understand exactly what you’re looking at and why it matters. And if the results raise any questions, our team is always happy to help interpret the results and guide you on the next steps.

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Cybercrime Is Changing and It’s Catching Businesses Off Guard

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The Technology Shifts Businesses Must Prepare for in 2026

By Quicksmart IT • January 30, 2026

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How to Keep Your Business Cyber-Safe Over the Christmas Break

December 10, 2025

Quicksmart talk to you about cyber security during the holidays, with practical tips and preventative measures you can use for your business.

Talk to us