Phishing remains one of the most common ways cybercriminals gain access to business systems. Instead of breaking through firewalls or exploiting complex vulnerabilities, attackers simply send an email designed to trick someone into clicking a link, opening an attachment, or handing over their login credentials.

October is Cybersecurity Awareness Month, making it the perfect time for businesses to revisit the basics. Knowing how to spot a phishing email is one of the simplest and most effective ways to protect your business, and it can be the difference between a normal workday and a costly security incident.

What Is a Phishing Email?

A phishing email is a fraudulent message designed to look like it comes from a trusted source, such as Microsoft, a bank, a vendor, or even someone inside your own company. The goal is to get the recipient to take an action that benefits the attacker.

That action might be entering a password on a fake login page, downloading a malicious attachment, approving a payment, or sharing sensitive information. Once an attacker has a foothold, they can access email accounts, steal data, launch additional attacks from inside the organization, or deploy ransomware. That’s why learning how to spot a phishing email matters for every employee, not just IT.

How to Spot a Phishing Email: 5 Red Flags

1. Urgent or Threatening Language

Phishing emails often create a sense of panic. Messages like “Your account will be suspended today” or “Payment overdue. Act immediately” are designed to rush the reader into acting before thinking. Legitimate companies rarely demand immediate action by email, and they don’t threaten to shut down your account within hours.

2. A Sender Address That’s Almost Right

Attackers frequently use email addresses that look legitimate at a glance. A message may display the name “Microsoft 365 Support,” but the actual address might be no-reply@micros0ft-securemail.com, using a zero instead of the letter “o.” Always check the full email address, not just the display name. Checking the sender is one of the easiest signs of a phishing email to catch.

3. Unexpected Attachments or Invoices

An invoice you weren’t expecting, a “shared document” from someone you don’t normally work with, or a voicemail notification with an attachment are all common phishing tactics. These files may contain malware or link to fake login pages, a technique we covered in our post on PDF phishing. If you weren’t expecting it, verify it with the sender through a separate channel before opening it.

4. Links That Don’t Match Their Destination

The text of a link can say anything, but the actual destination may be very different. Before clicking, hover your mouse over the link (or press and hold on a mobile device) to preview the real web address. If the domain doesn’t match the company the email claims to be from, don’t click. Mismatched links are one of the most reliable phishing email red flags.

5. Requests for Passwords, Payments, or Gift Cards

Organizations not will ask you to send your password by email. Requests to purchase gift cards, change bank account details, or send a wire transfer, especially when they appear to come from an executive, are major warning signs. These requests should always be verified by phone using a number you already know.

New Phishing Tactics to Watch For

Phishing continues to evolve, and attackers are constantly finding new ways to get past both security tools and employees. Even if you already know how to spot a phishing email, these newer tactics are worth knowing.

• QR Code Phishing: Emails or PDFs containing QR codes that direct users to fake login pages on their mobile devices, often bypassing email security filters.
• Fake Invoices and Payment Changes: Attackers impersonate vendors and request updated banking information so future payments go to the attacker’s account.
• AI-Generated Emails: Artificial intelligence allows attackers to write convincing, error-free messages, so poor spelling and grammar are no longer reliable warning signs.
• Thread Hijacking: Attackers reply within real email conversations using a compromised account, making the message appear completely legitimate. Learn more in our post on thread hijacking.
• Text and Phone Scams: The same tactics now arrive by text message (smishing) and phone call (vishing), often pretending to be IT support or a bank.

How Businesses Can Protect Themselves

Stopping phishing requires a layered approach that combines technology, monitoring, and employee awareness. These are the core cybersecurity solutions we recommend.

Security Awareness Training Creates a Human Firewall

Employees are often the first and last line of defense. Regular security awareness training teaches staff how to spot a phishing email, identify suspicious links, and recognize social engineering tactics.

Phishing Campaigns Test and Strengthen Employee Readiness

Simulated phishing campaigns allow businesses to safely test whether employees know how to spot a phishing email in a realistic setting.

Multi-Factor Authentication (MFA) Adds a Critical Layer of Protection

Even if a password is stolen, MFA requires a second form of verification before access is granted. This makes it significantly harder for attackers to use stolen credentials to break into email and business accounts.

Email Domain Protection Helps Stop Impersonation

Email authentication protocols such as SPF, DKIM, and DMARC help prevent attackers from spoofing your company’s domain, protecting both your employees and your customers from impersonation attempts. Learn more about our email authentication and security services.

Spam Filters Reduce Exposure to Malicious Emails

Advanced spam filtering blocks many phishing emails before they ever reach an inbox. Fewer malicious emails in front of employees means fewer opportunities for a successful attack. Combined with filtering, training your team to recognize a phishing email creates two strong layers of defense.

DNS Filtering Blocks Access to Fraudulent Websites

If an employee does click a malicious link, DNS filtering can block access to known phishing and malware sites, stopping the attack before credentials are entered or malware is downloaded. Together with employees who can identify phishing emails, DNS filtering adds another strong layer of protection.

Endpoint Detection and Response (EDR) Identifies Suspicious Activity

EDR continuously monitors computers and devices for unusual behavior. If a phishing attack leads to malware or unauthorized activity, EDR can detect and isolate the threat quickly.

SIEM and SOC Services Provide Continuous Monitoring

SIEM and SOC services collect and analyze security data across your environment around the clock. This allows suspicious login attempts, account compromises, and other warning signs to be identified and responded to in real time.

Final Thoughts

Phishing emails continue to be one of the most effective tools cybercriminals use because they target people rather than technology. The good news is that most phishing attempts leave clues, and once your team knows how to spot a phishing email, they can recognize one in seconds. Share the phishing email red flags in this guide with your team and revisit them regularly.

By combining employee awareness with Security Awareness Training, Phishing Campaigns, MFA, Email Domain Protection, Spam Filtering, DNS Filtering, EDR, and SIEM/SOC monitoring, businesses can build a layered defense that stops phishing attacks before they become costly incidents.

This Cybersecurity Awareness Month, take a few minutes to share these red flags so everyone on your team knows how to spot a phishing email. Want to learn how CTS can help protect your business from phishing and other cyber threats? Contact us today to learn more.