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Aug 22, 2025 • 1 min read

Content CreationEmail Marketing / Newsletters

Gmail Label System for Email Subject Line Swipe Files

Build a proven email subject line swipe file by testing what grabs attention in a crowded inbox with 700K+ emails competing for focus.

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Deep dive: The Gmail Labels Swipe File System: How to Build a Database of High-Converting Email Subject Lines to learn more about this strategy.

Alex Kirillov
Alex Kirillov
@alexejkirillov
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