Email remains the main channel of business communication and, at the same time, one of the most dangerous attack vectors for organisations. Phishing attacks, malware attachments, and ransomware delivery, as well as attacks such as business email compromise and credential harvesting, are distributed through email. According to research, about 94% of malware is distributed via email, and more than 80% of all cyberattacks are related to phishing campaigns.
Such statistics explain why companies are implementing email security gateways and other solutions for email threat detection, malicious email filtering, and layered cybersecurity defence.
Why Email Remains the Main Attack Vector
Almost every organization uses email for daily work. The average employee sends and receives about 121 emails per day.
If a company has 5,000 employees, the total flow can reach 605,000 messages daily. Even with 99.9% filtering accuracy, approximately 605 potentially malicious emails can end up in employees’ mailboxes.
This creates a huge attack surface expansion and makes email a convenient tool for:
- Phishing campaigns
- Spear phishing attacks
- Account takeover
- Malware distribution
- Ransomware payload delivery
- Data exfiltration
In addition, remote work increases the risks. Research shows that 62% of employees work remotely, and many continue to use personal devices and various email services.
Such an environment increases the likelihood of a credential theft, social engineering attack, and email impersonation attack.
Companies addressing these risks often combine proactive email security with broader infrastructure protection strategies like IT AMC Dubai, which ensures continuous monitoring and maintenance of corporate systems.
What is an Email Security Gateway?
An email security gateway is an email traffic monitoring and threat filtering system located between the Internet and the organisation’s email infrastructure.
The main task of such a solution is to perform:
- Malicious email filtering
- Email scanning and filtering
- Spam filtering
- Content inspection
- Sender reputation analysis
- Malicious link detection
Gateway analyses inbound email filtering and outbound email filtering by checking:
- Message header inspection
- Message content inspection
- URL reputation filtering
- Malware attachment scanning
If the email contains threat signs, the system applies policy-based security controls and performs a threat containment mechanism, for example:
- Blocking
- Quarantine
- Deleting an email
- User warning.
The Main Threats That Spread Via Email
Phishing and Spear Phishing
A phishing attack is an attempt to fraudulently obtain credentials, financial data, or access to corporate systems.
There are different forms:
- Mass phishing campaigns
- Spear phishing
- Whaling attacks
- Business email compromise
The attacks use social engineering techniques, display name spoofing, domain spoofing, and look-alike domains.
Malware and Ransomware
Email is often used for malware distribution via:
- Malicious attachment
- Weaponized files
- Macro documents
- Compressed malware payload
Multi-stage ransomware attacks are also common, when an email contains a loader that downloads the main ransomware payload.
Without proper monitoring and recovery planning, such attacks can cause catastrophic data loss. This is why many organisations combine email protection with disaster recovery strategies, such as backup your data in Dubai, ensuring that critical files remain recoverable even after a security incident.
Credential Harvesting and Account Takeover
Credential harvesting detection has become a key goal of email security. Attackers create fake login pages and collect:
- Logins
- Passwords
- Two-factor codes
After that, an account takeover occurs, and the attackers use the email account for a thread hijacking attack or invoice fraud attack.
Technologies used in the Email Security Gateway
Spam filtering and reputation analysis
Gateway applies:
- Sender reputation analysis
- IP reputation filtering
- Heuristic analysis
- Bayesian filtering
This allows you to block most spam emails and known phishing domains.
Machine Learning Detection
Modern systems use the machine learning security model to:
- Behavioral anomaly detection
- Phishing detection algorithm
- Malicious domain detection algorithm
The models analyse hundreds of letter parameters:
- Text style
- The structure of the message
- The history of communication
- Sender’s behaviour.
Natural Language Processing Detection
Natural language processing detection helps to detect a social engineering attack even without malicious attachments.
Such systems detect:
- Unusual urgency
- Financial inquiries
- Attempts at an executive impersonation attack.
Sandboxing and Dynamic Analysis
Sandbox malware analysis runs suspicious files in an isolated environment.
Used:
- Attachment sandboxing
- URL sandboxing
- time-of-click protection
This helps to identify:
- Zero-day threats
- Payloadless phishing
- Polymorphic malware.
DNS-level of Protection and Network-Level Protection
When the user clicks the link in the email, the system generates a DNS request.
DNS security monitoring solutions allow you to:
- Block malicious domains
- To detect DNS tunneling detection
- Detect command and control detection.
This network-level protection is difficult to circumvent because it works independently of email clients.
Why Email Protection Alone is Not Enough
Despite the effectiveness of the email security gateway, modern attacks are becoming more difficult.
For example:
- 48.3% of attacks are sent from compromised accounts, which allows you to bypass filtering.
- The number of attacks bypassing filters increased by 52.2% in one quarter.
In addition, the attackers are actively using AI. 82% of phishing toolkits mention deepfake technologies, while 74.8% use AI mechanisms.
Therefore, companies are moving to layered cybersecurity defence.
Layered Defense and Defense-in-Depth
Effective email security architecture includes several levels of protection:
1. Gateway Level
- Malicious email filtering
- Spam filtering
- URL reputation filtering
2. Endpoint Security Integration
- Protection of workstations
- Preventing endpoint compromise
3. DNS Protection
- Malicious domain detection
- Blocking the C2 infrastructure.
4. Security automation
- Security orchestration automation
- Automated threat response
- SOC playbooks.
5. Human-Centric Security
- Phishing awareness training
- Phishing simulation campaign
- User behaviour monitoring
With this approach, the risk of a successful attack is reduced to almost zero.
Financial Consequences of Email Attacks
Email attacks can lead to serious losses. The average cost of a data leak reached $4.88 million.
At the same time, the use of security automation and automated incident response reduces the cost of an incident by approximately $2.2 million.
Therefore, companies invest in:
- Integrated security platform
- Extended detection and response
- Behavioural threat analytics.
The Role of Employees in email protection
Even the most advanced email security technology cannot stop all attacks.
That is why they are important:
- Security awareness training
- Phishing simulations
- Interactive warnings
Employees should be able to recognise:
- Impersonation attack
- Spoofing attempts
- Malicious links
- Unexpected attachments.
Email remains the main channel for the spread of cyberattacks. Phishing campaigns, malware attachments, credential harvesting, and ransomware delivery are distributed through it.
An email security gateway plays a key role in protecting organisations by:
- Malicious email filtering
- Machine learning detection
- Behavioral anomaly detection
- Sandbox malware analysis
- DNS security monitoring
However, maximum protection is provided only by layered cybersecurity defence, which includes:
- Gateway-protection
- Endpoint security
- DNS filtering
- Security automation
- Employee training.
Only this approach makes it possible to effectively detect email threats, prevent account compromise, and protect corporate data.