Email Testing Best Practice : From Address Tests

As always, make sure that your A/B split is clean. Because your success metric will be open-rate, it's imperative that your lists be as similar as possible. You must test the email "from" address early. Because it can have such an impact, you'll want to settle on your preferred format early and stick with it. It is an important component to test, because users need to know where or from whom the email is coming. If the sender information is not clear, your email may be trashed or marked spam.

Be aware of spam issues! Your from address greatly impacts your ability to make it into the inbox. Test to make sure you're being delivered before you send to your entire list. The best "from" address can be situational. One may work better for transactional emails and a different one may be better for marketing emails.

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