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Can you test Email Subject Lines at 10% of List first, then the rest with Winning subject line

Question asked by aab9d06c0729beb816e643fea6bfa099ca7562ee on May 26, 2016
Latest reply on Jun 2, 2016 by Keith Nyberg

Is there a way to do a A/B split test with email subject lines, but for only 10-20% of the targeted audience from my smart list, then for the remaining portion of the list choose the winning subject line ?

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