Email Content Security Tools

Analyze links for deception, validate HTML/CSS compatibility, clean tracking parameters, and inline styles for maximum deliverability

Link Security Analyzer

Detect deceptive links, homoglyphs, URL shorteners, and suspicious patterns in your email content

Threat Detection Capabilities

Link Deception

Detects when link text doesn't match the actual destination URL

Homoglyph Attacks

Identifies lookalike characters (e.g., Cyrillic 'а' vs Latin 'a')

URL Shorteners

Identifies bit.ly, tinyurl, and other link shortening services

Zero-Width Characters

Detects hidden zero-width unicode characters in URLs

Punycode/IDN

Flags internationalized domain names that may be confusing

Suspicious Patterns

IP addresses, excessive subdomains, embedded credentials

Content Security & Validation

Link Security

  • Detect deceptive links and phishing attempts
  • Identify homoglyph attacks (lookalike characters)
  • Flag URL shorteners and suspicious patterns
  • Analyze zero-width characters
  • Validate punycode/IDN domains

HTML/CSS Validation

  • Detect unsupported HTML elements
  • Identify blocked external resources
  • Validate CSS property support
  • Check media query compatibility
  • Score email client compatibility

URL Cleaning

  • Identify and remove tracking parameters
  • Distinguish UTM from third-party tracking
  • Optimize URLs for privacy
  • Reduce excessive parameter count
  • Build clean campaign URLs

CSS Inlining

  • Convert embedded CSS to inline styles
  • Maximize email client compatibility
  • Remove unsupported style tags
  • Ensure consistent rendering
  • Support for simple selectors

Email Security Threat Landscape

Deceptive Links

Links that display one URL but actually point to another destination

Example:<a href="https://evil.com">paypal.com</a>

Impact: Phishing, credential theft, malware distribution

Homoglyph Attacks

Using lookalike characters to create fake domains that appear legitimate

Example:раypal.com (Cyrillic 'а' instead of Latin 'a')

Impact: Domain spoofing, brand impersonation

Zero-Width Characters

Hidden Unicode characters that make URLs appear different than they are

Example:exam‌ple.com (contains invisible characters)

Impact: URL obfuscation, spam filter evasion

IDN Homograph Attack

Using internationalized domains to create visually similar URLs

Example:xn--pypal-4ve.com (punycode)

Impact: Confusion, misplaced trust

Content Security Best Practices

Link Validation

Always validate that link text matches the actual destination URL

HTTPS Only

Use HTTPS for all links to ensure encrypted connections

Minimal Tracking

Use 3-5 UTM parameters maximum, avoid excessive third-party tracking

Inline Styles

Convert all CSS to inline styles for consistent email rendering

Email-Safe HTML

Use table layouts, avoid JavaScript, forms, and unsupported elements

Test Thoroughly

Test emails across multiple clients before sending to your list