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The Ballantine Corporation just released their December 2008 direct mail case study and it features an outer envelope test from their client, New Jersey Monthly. Ballantine handled the printing and mailing of the project.
They tested 2 different #10 OEs against their control in a December 2007 mailing with a quantity of 25,000 each. The guts and offer of both test packages were exactly the same...the only difference was the outer envelope.
Neither test package beat the control, but when comparing the two OE tests, one performed about 18% better than the other.
Can you guess which one it was?
To view the case study in full including details and pictures, please visit:
http://www.ballantine.com/blog/2008/12/december-case-study/