- Pull two small sample files from your main list and send the same message to both with a different subject line for each one. Wait two to three days before looking at the conversions to see which subject line wins, then mail the remainder of the file with the winning subject line.
- As a follow-up to sending any given promotional e-mail, segment out the people who didn't open the message and resend the same creative with a new subject line. For the two combined messages, you’ll experience anywhere from a 20 percent to 50 percent boost in sales.
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