A comprehensive 2026 analysis reveals which email obfuscation techniques actually work against spammers. Testing 318 spam bots, the study found HTML SVG and CSS display:none methods blocked 100% of harvesters, while plain text with no protection stopped 0%. The research evaluated 15 different techniques across plain text and clickable link formats.

Surprisingly, simple HTML entities blocked 95% of spam bots despite being easily decoded by server-side libraries. JavaScript concatenation also achieved 100% blocking but exposed full email addresses in source code, making it unsafe. The study emphasizes combining multiple techniques by splitting email addresses into segments, each protected differently.

For practical implementation, HTML SVG emerged as the top recommendation since it hides addresses in plain text within an unusual location that most harvesters miss. CSS display:none ranked second for its accessibility and effectiveness. The research warns against techniques that break usability like symbol substitution or instruction-based methods, which force users to manually reconstruct addresses before sending.