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underdown

Emojis in subject line reliably increase open rate in my experience. Also others report the same:

https://www.outreach.io/blog/will-emojis-increase-reply-rate...

Maybe SO emails go over the top though

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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.

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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