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I know the results are biased given it's a sample from OP inbox but I'm surprised not so see https://postmarkapp.com/ here. I thought they were pretty popular.

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I've never heard of them before this comment. Maybe they're popular only in certain regions.

They're just for transactional emails, not for marketing ones. They wouldn't show very much based on how he's measuring.

It seems this post is about transactional emails, not marketing ones. CF the first paragraph!

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