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If you aren't testing, then you are just guessing, which is poor business practice.
Use Google Experiments. This is a brilliant and powerful tool for increasing your ROI (use this YouTube video as your introduction)
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Test something every time
Testing is a classic way for direct marketers to refine their efforts to get the best results. If each of your email campaigns doesn’t include a testing component, you’re missing out on an opportunity to improve your ROI. Some elements you may want to test include:
Your results will provide new ideas for more effective campaigns and help you get rid of offers, lists or creative that aren’t working.
- Why testing is mandatory.
- Eight steps to a successful email test.