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Cold Email Subject Lines: What Actually Works in 2026
Most subject line advice is from 2019. Here's what's changed, why curiosity-gap subjects are burned, why ultra-short still wins, and how to measure performance when open rate lies.
Most subject line advice is from 2019. Here's what's changed, why curiosity-gap subjects are burned, why ultra-short still wins, and how to measure performance when open rate lies.