Five Warning Signs Your Email Security Is Failing

Despite all the latest technological advancements we have had in the past few decades, it’s amazing to think just how central still is to most business operations. Contracts, invoices, marketing outreach, client comms, internal approvals. Most of it all still runs through the inbox. Long live email!

But while it still be the most convenient and effective channel for all these things, one thing a lot of business leaders fail to recognize is how exposed their company email might be, especially now that most have fully migrated to the cloud and moved away from secure on site servers.

According to the FBI’s Internet Crime Complaint Center, business email compromise resulted in losses of over $3 billion in 2025 alone. This makes it the second most financially damaging form of cybercrime on record, which is a startling statistic. And to make matters worse, this is based solely on the number of incidents that have been reported. The real number is almost certainly higher.

The challenges for growing companies is that these vulnerabilities don’t make themselves obvious. They’re usually hidden away, building quietly before someone comes along and exposes them. Here are five signs that your business email security setup may need a closer look.

Why relying on default email security settings is risky

Cloud email providers like Microsoft 365 and Google Workspace come with built-in spam and malware filtering. These solutions do catch a lot, but they were built for protecting a massive user base rather than individual organizations that are facing more targeted attacks. Sophisticated AI-driven phishing campaigns, impersonation attempts, and social engineering are all designed to slip through these kinds of filters.

If your company has never layered additional protection on top of its cloud email platform, that gap between “good enough for most” and “adequate for your business” is worth taking a closer look at. Dedicated enterprise email security solutions close that gap by adding threat detection that goes beyond what built-in tools are designed to catch.

Why internal email traffic is a major blind spot

Most legacy email protection tools work by rerouting all incoming messages through a gateway while on its way to the inbox. While this is effective in many cases, it has a blindspot in that these tools only scan for threats that come from outside the organization’s network.

Messages that are sent internally (between colleagues, departments, and offices) go unmonitored. This presents a serious threat in that if one account is compromised, it can be used to send malicious content to other accounts within the organization without triggering the email security software.

In other words, this means you’re only monitoring the front door, completely ignoring any threats that are already present inside the building. This is where modern enterprise email security solutions stand apart, as they monitor both external and internal communication flows.

Why phishing training alone is not enough

For all the publicity that phishing gets, it still continues to be one of the most successful attack vectors for cybercriminals. Despite the massive amounts spent on training and public awareness, people still fall for these scams on a regular basis. And now that AI is supercharging the attacks by making them far more personalized and believable than ever before, even the more cautious amongst us are falling victim.

So if your employees are constantly clicking on simulated phishing emails as part of your training program, that’s a signal to you that your technical defenses better be up to scratch. Relying on training alone to secure your data and systems is a transfer of security responsibility to the employees in your company. And that’s simply not a strategy that will stand up long term. Enterprise email security solutions are increasingly designed to detect these advanced phishing techniques, even when they bypass traditional filters.

Why email security setup requires MX record changes

This one is more technical, but worth understanding. Some email security solutions require changes to MX records, the DNS entries that are used to tell the internet where to send your emails. By changing these records, all incoming emails will route through your email security vendor’s server.

There’s a problem with this. For one, MX records are public information. Anyone can see which email security vendor you use and attackers can then tailor their approach accordingly. At the same time, changing MX records can be disruptive to implement and maintain, especially if you have a growing business with multiple domains and cloud migrations.

An API-based email security solution avoids this issue altogether. These solutions can integrate directly with your cloud email solution, such as Microsoft 365, without any changes to your MX records. For companies that have already adopted various cloud tools for their digital transformation, an API approach like this will almost always work better with your existing infrastructure. Enterprise email security solutions are designed specifically to address these types of gaps, particularly in cloud-based environments where traditional tools fall short.

Why lacking visibility into collaboration platforms is problematic

Email is one channel of many. Teams, Slack, SharePoint, Google Drive, Dropbox. All of these platforms contain crucial files and data that are shared every single day. However, most email security solutions only protect the inbox.

If your organization has adopted collaboration platforms without extending the security policies to them, you have created new avenues for the same types of threats that your email security tools are aimed at stopping. A file shared on one of these platforms can contain the same type of threat as a malicious file within an email but with fewer safeguards around it.

Why enterprise email security solutions are no longer optional

None of these warning signs require a crisis for you to get the motivation to address them. That’s the advantage. Strengthening email protection is one of the more practical, high-impact investments that a business can make in safeguarding itself, because the inbox remains the most common entry point for financial fraud, data theft, and ransomware.

With the shift to cloud-based work, email security has become more important than ever before. At the same time, it has also become more complex. While there are a variety of tools and methods for improving email security, none of them are going to be very effective in isolation. Companies that recognize where the gaps are, and act before those gaps are exploited, put themselves in a much stronger position.

For any company that is still relying on the same email protection tools that it had before it began moving to the cloud, these five warning signs are a great starting point for starting to ask yourself some harder questions. Investing in enterprise email security solutions is no longer optional, but a foundational requirement for any organization operating in the cloud.