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It's actually easier to perform split testing with email marketing campaigns, because you can often do it without special software. You can divide your mailing lists into as many different groups as you want to test. Send a different email -- best to make the really, even radically different. You can even set them up to filter any replies or return mail into different folders. Then check the results in each folder. It's not all that sophisticated at this base level, but it can work. As you use more sophisticated email marketing software, some include an A/B split testing button, which automatically segments mailing lists. But you can do it on your own easily enough.