How Business Can Prevent Cyber Attacks with Email Security Services

How Every Small and Medium Business Can Prevent Cyber Attacks with Email Security Services

Email security is vital for small and medium businesses that need protection from cyberattacks. Most malware (94%, according to one figure) gets into businesses via email. This includes attacks such as ransomware, tech supply-chain breaches, and other issues that cause downtime and data loss. Small and medium businesses need to take precautions to improve their security and prevent cyberattacks caused by malicious emails.

A managed service provider can help achieve this goal by defending against some of the most common threats. To prevent email security problems, the right services make it easier to keep your business safe.

The Current State of Email Cyberthreats and Countermeasures

About 90% of cyberattacks originate from email. Email is the weakest link in the security chain for many businesses and needs to be addressed to improve security and prevent attacks. There are multiple types of cyber attacks carried out through email that businesses need to be aware of and know how to avoid.

Some of the cyber-attacks you can experience via email include:

• Spoofing and phishing
• Email security gaps
• Malicious files
• Ransomware
• Misconfigurations
• And more

During the coronavirus pandemic, businesses had their vulnerabilities exploited by a variety of cybersecurity threats. For example, phishing attacks with emails claiming to have a cure for the virus or provide financial relief were common.

Businesses use a range of countermeasures to prevent email cyber threats with help from their IT teams or from outsourced managed service providers. Methods include encrypting data, employee education, and careful access management.

How Should Businesses Respond When an Employee Clicks a Malicious Email Link?

When an employee clicks a malicious email link, businesses should respond immediately to contain potential threats, determine whether credentials or sensitive data have been compromised, and prevent further damage. The security team should treat the incident as a potential phishing or malware event until the investigation confirms the risk level.

1. Contain the Potential Threat

Immediately assess the affected device and isolate it from the corporate network if you suspect malware execution or unauthorized activity. Disconnecting the device from Wi-Fi or Ethernet can help limit lateral movement, while security teams use endpoint detection and response (EDR) tools to investigate suspicious activity. Avoid shutting down or wiping the device before collecting evidence, unless necessary to prevent ongoing harm.

2. Determine What Happened After the Click

Review email gateway logs, web proxy records, browser history, endpoint alerts, and security monitoring data to establish whether the link downloaded a file, opened a credential-harvesting page, or triggered malicious code. Check for unusual processes, unauthorized connections, and suspicious account activity to determine whether the incident extends beyond the initial click.

3. Reset Compromised Credentials and Revoke Active Sessions

If the employee entered a password, shared sensitive information, or approved an unexpected multifactor authentication (MFA) request, secure the affected account immediately. Reset compromised passwords from a trusted device, revoke active sessions and refresh tokens, review MFA settings, and check for unauthorized account changes. If you reused the password elsewhere, secure those accounts as well.

4. Remove the Malicious Email and Block Related Threats

Search mailboxes for copies of the phishing message and remove them where appropriate. Block confirmed malicious URLs, sender addresses, domains, and file hashes using email security gateways, DNS filtering, web proxies, and endpoint security tools. Review whether other employees received or interacted with the same message, and investigate any additional affected devices or accounts.

5. Eradicate Malware and Restore Systems Safely

If the investigation confirms malware execution, use endpoint security tools and forensic analysis to identify and remove malicious files, persistence mechanisms, and unauthorized access. Reimage affected devices when necessary, patch exploited vulnerabilities, and restore systems from trusted backups if required. Reconnect devices only after security teams verify the threat is contained and remediation is complete.

6. Document the Incident and Improve Employee Awareness

Record the incident timeline, affected systems, compromised accounts, containment measures, business impact, and recovery actions. Use the findings to improve email filtering, enforce MFA, update incident response procedures, and strengthen phishing awareness training. Encourage employees to report accidental clicks promptly without fear of blame, since early reporting helps security teams respond before an incident escalates.

How Companies Can Measure the Effectiveness of Email Security Services?

Companies should evaluate email security services using a combination of threat-detection, employee-behavior, and incident-response KPIs. Track these metrics monthly and compare them against a baseline to identify weaknesses, measure improvements, and determine whether security controls are reducing email-related risks.

Key KPIs include:

Phishing click rate: Measure the percentage of employees who click links in simulated phishing emails. A declining rate indicates improved awareness, but interpret results alongside real-world threat severity and simulation quality.

Phishing reporting rate: Track the percentage of employees who correctly report simulated phishing emails and the proportion of actual suspicious emails users report. Higher reporting rates help security teams identify threats that bypass automated filters.

Malicious-email detection rate: Calculate the percentage of confirmed malicious emails detected and blocked by security controls out of all confirmed malicious emails observed across monitored sources. Combine this metric with threat intelligence and incident findings to identify gaps in detection coverage.

False-positive rate: Measure the proportion of legitimate emails incorrectly classified as malicious or quarantined. Excessive false positives can disrupt business communications, delay important messages, and reduce user confidence in email security tools.

Time to contain incidents: Measure the time between identifying a malicious email incident and completing containment actions, such as blocking the threat, deactivating a compromised account, or revoking active sessions. Shorter containment times can reduce the opportunity for attackers to cause damage.

Account compromise frequency: Track confirmed email-related account compromises over a defined period, normalized by the number of active accounts where practical. Review recurring causes, such as credential theft, MFA fatigue, and session-token theft, to determine whether additional controls are needed.

Businesses should review these KPIs alongside malware detection, business email compromise incidents, email-delivery delays, and service-level agreement (SLA) performance. Define metrics clearly, use consistent reporting periods, and examine trends rather than relying on individual figures. The most effective email security service improves threat detection and response while minimizing disruption to legitimate business communications.

How do Email Security Gateways Block Malicious Links and Attachments?

Email security gateways block malicious links and attachments by inspecting incoming messages, evaluating URLs and files for known or suspected threats, and preventing dangerous content from reaching employees. They combine reputation databases, real-time analysis, malware scanning, and automated quarantine to detect phishing attempts, malicious downloads, and other email-borne threats.

URL reputation checks: Gateways compare links in emails against threat-intelligence databases and reputation services to identify known phishing sites, malicious domains, and suspicious URLs. They may rewrite links so that users are redirected through a security service before reaching the destination.

Time-of-click protection: Because a legitimate-looking URL can become malicious after an email is delivered, some gateways recheck the destination when a user clicks the link. If the website has since been flagged as dangerous, the security service blocks access or displays a warning.

Attachment scanning: Gateways inspect attachments for known malware, suspicious file structures, malicious scripts, and potentially dangerous file types. Antivirus engines and file-analysis tools help detect threats in documents, archives, executables, and other attachments before delivery.

Sandboxing: Security tools open suspicious attachments in an isolated environment and monitor their behavior. Files that attempt to download malware, execute unusual commands, or communicate with malicious servers can be blocked or quarantined. Some advanced systems also use static and behavioral analysis to detect previously unknown threats.

Quarantine and message isolation: Messages containing confirmed threats, suspicious links, or risky attachments can be quarantined instead of delivered to users. Administrators can review these messages, release legitimate emails that were incorrectly flagged, and investigate detected threats.

Handling suspicious messages: Depending on the organization’s security policies and the threat’s severity, gateways may reject a message, remove a malicious attachment, rewrite or disable a dangerous link, deliver the message with a warning, or route it for further analysis. Security teams can also search for and remove similar messages from other mailboxes if they discover a threat after delivery.

Businesses should combine gateway protection with multifactor authentication (MFA), endpoint detection and response (EDR), employee phishing awareness, and incident-response procedures. Because attackers can use newly created domains, encrypted attachments, and previously unknown malware, no gateway can guarantee it will detect every malicious message.

Best Practices for Email Security

Businesses should follow several best practices for email security. Both businesses and their employees can follow some of these best practices to prevent attacks.

Some simple practices that businesses can encourage employees to take include:

Creating strong passwords

Use a password manager if you use multiple online accounts. This is because managing different usernames and passwords across various websites can become very tedious. If someone gets hold of one username/password combination then they could potentially access many sites at once. It’s best to create unique passwords for each website that you visit. Make them long enough but not complicated. Don’t forget to change your passwords regularly.

Using two-factor authentication

Two-factor authentication adds another layer of protection to your account login process. 2FA requires users to enter the second piece of verification code after entering their credentials. The added step means hackers would also need this additional confirmation method to gain access to your account. There are plenty of options available including text messages sent via apps, phone calls, and SMS texts. Some providers offer free codes while others charge per message. Ensure you choose a reputable company that offers good customer support.

Learning to recognize phishing emails

Learning to recognize phishing emails is the first step in preventing cyber attacks. But what if you don’t know how to identify a legitimate email from one that isn’t? Here are some tips for recognizing fake messages:

1. Look at the sender’s address. If it doesn’t look like an official company or organization, then it probably isn’t legit.
2. Check the message subject line. It should be something specific about your business or industry.

Only use secure devices

If you are sending sensitive information such as credit card numbers or bank details, use a secure device. This means that the device has a PIN code or fingerprint scanner so that only you can access the data.

Set Up Email Filters

Email filters allow you to set rules based upon certain criteria. For example, you may want to block emails containing attachments unless you know what type of file they contain. Or perhaps you’d prefer to only receive emails from specific people. Setting these rules helps stop unwanted spam from reaching your inbox. However, be careful not to filter too much content. Otherwise, you’ll miss legitimate communications, which might otherwise cause harm to your business.

Keep Your Software Updated

Software updates keep your computer or device safe against viruses and other malware. Updates often include bug fixes in existing programs. These patches ensure all installed applications work properly together. Updates can also include new features. Regularly check for updates to your operating system and third-party software.

Install Antivirus Protection

Antivirus software scans files and folders looking for malicious activity. When it finds something suspicious, it alerts you and stops further damage from being done.

Avoid Opening Attachments From Unknown Sources

If you receive an attachment from an unknown sender, do not open the document. Instead, delete it immediately. Never click links within an email without first checking its source. Hackers sometimes disguise themselves as trusted sources. They may send phishing scams where they pretend to be trustworthy companies and ask for personal information. Be wary of anything that seems unusual. Always double-check before providing sensitive details.

Do Not Receive Emails From Unverified Addresses

Never respond to any unsolicited communication from anyone claiming to represent a bank, credit card provider, utility service, etc. You never know whether the person on the other end has been hacked by cybercriminals.

Check Spam Folder Regularly

Spammers love sending junk mail through your mailbox. To avoid getting caught up in their schemes, scan your spam folder every day. Delete everything there so you don’t accidentally reply to fraudulent emails.

Small and medium businesses should be sure to put strong email defenses in place, encrypt email, and help to manage passwords. Good antivirus and endpoint protection measures are also important.

How to Protect Your Business from Data Breaches

If you want to protect your business from data breaches, you need to have better email security services. Phishing emails and other email security issues can lead to malware that causes a data breach, resulting in downtime, reputational damage, loss of important information, and more.

By tightening your email security, you can prevent malicious emails from being opened or even from reaching anyone’s inbox. Managing cybersecurity for your business can be hard when you only have limited resources. Many SMBs have small IT budgets, which makes it hard to focus on specific security areas like email security.

Managed services can help you protect your small or medium business against cyberattacks. A managed IT service provider gives you all of the benefits of your own IT department in an affordable and straightforward way.

They can provide a range of services to keep your business secure, such as cyber threat monitoring. A proactive approach to email security and other cybersecurity issues helps prevent problems, rather than putting out fires.

A managed service provider will do several things to protect your business. They can collect important information about the latest threats, monitor and detect any threats, and respond to any threats quickly and efficiently. Predicting the threats to your business before they occur prevents a range of issues, from downtime to data loss.

Managed ransomware services and managed endpoint security are two of the services that can help your business to avoid email security issues.

Your business can have everything managed by experts so that you don’t need to spend time doing it. Solutions such as antivirus software help to both prevent and tackle potential threats.

You can rely on a managed service provider to help you deal with any issues swiftly so that you can quickly get back to your usual business activities when there are any problems. Robust email security can reduce downtime and ensure your business remains up and running when it matters most. You can avoid losing data, money, and customers by making your business email more secure.

Prevent cyber attacks with email security services from a managed service provider like ExterNetworks to protect your business.