Phishing

What Is Phishing?

Phishing is a type of cyberattack in which fraudulent emails impersonate trusted entities — banks, technology companies, government agencies, or colleagues — to deceive recipients into revealing sensitive information (passwords, credit card numbers, banking credentials) or installing malware. The name is a play on "fishing" — attackers bait victims with convincing-looking messages and wait for them to bite. Email is the primary delivery mechanism for phishing attacks worldwide.

How Phishing Emails Work

Phishing emails typically forge the "From" address to look like a legitimate source (your bank, PayPal, Amazon, Microsoft). The message creates urgency ("Your account has been suspended — verify immediately"). It includes a link to a convincing-looking fake website that captures credentials, or an attachment containing malware. The sophistication ranges from obvious mass-market scams with typos to highly targeted "spear phishing" attacks tailored to specific individuals using personal information gleaned from social media or data breaches.

Email Authentication as Anti-Phishing Defense

SPF, DKIM, and DMARC are specifically designed to defend against phishing by preventing domain spoofing. SPF limits which servers can send on behalf of your domain. DKIM cryptographically signs messages from your domain. DMARC enforces policy on messages that fail SPF or DKIM checks and requires alignment between the From header domain and authenticated domain. At p=reject, DMARC prevents fraudulent emails using your domain from reaching recipients — the most powerful defense brand owners have against phishing using their identity.

Phishing and Sender Reputation

When phishers abuse a domain (spoofing it in From headers), spam reports and user complaints get attributed to that domain — even though the domain owner is the victim, not the perpetrator. This reputation damage can affect the legitimate sender's deliverability. Deploying DMARC at p=reject ensures that fraudulent use of your domain is rejected before it reaches users, preventing this "reputation theft." This is why DMARC is as much a brand protection tool as an authentication tool.

Recognizing Phishing

Urgency and fear tactics. Requests for login credentials, payment information, or sensitive data via email link. Mismatched or slightly misspelled sender domains (paypa1.com, amazon-security.net). Generic greetings ("Dear Customer") when personalized communication would be expected. Unexpected attachments. Links that don't match the displayed text when you hover over them. These signals apply whether you're protecting your own users or training your team to recognize attacks.

Email Verification and Phishing Prevention

Email verification isn't a phishing defense tool per se — it validates addresses, not intent. However, maintaining a clean, verified list reduces the risk of your own email being flagged as suspicious by spam filters that have been tuned to catch phishing-like behavior. Combined with proper authentication (check your SPF and DMARC setup with free tools at emailverify.io/tools), email verification helps you maintain the sending profile of a legitimate, trustworthy sender.