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Comment by derenge | Hacker News Reader

How much did they increase your open rate?

The linked report actually indicates a decrease in replies.

  Combined across all seven test variations, we saw a 42% decline in reply rate when the subject line featured emojis.

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Tbh I've never optimized for reply rate so this could have been true for me as well. Generally selling dtc. Open rate and sales increased reliably 10-15%. Haven't done any comparable email marketing in two years so things may have changed since then and obviously my anecdata may not be true for you.

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