Personalized first line vs personalized P.S.: which moved replies

Personalized first line vs personalized P.S.: which moved replies

A team tested where personalization lands best. 600 prospects, split: Group A had a custom first line, generic body. Group B had a generic opener but a hyper-specific P.S. referencing a recent company post. Both via Smartlead, same offer.

— Group A (custom first line): 8% reply
— Group B (custom P.S.): 11% reply

The P.S. won. Theory: a researched P.S. after a clean pitch reads as a genuine afterthought, not a templated hook everyone now recognizes.

Pros (P.S. approach)
— Dodges the over-used "I saw you..." opener fatigue
— Body stays scannable
Cons
— Still needs real research per prospect
— Harder to scale than first-line merge

Verdict: 4.5/5. The custom-opener is so common it's now pattern-matched as spam; the P.S. isn't yet.

Who it's for: senders whose first-line personalization has stopped working. Skip if you can't research at the per-prospect level either way.