The roll-out rule says that after a successful direct mail test, you can safely roll out to up to ten times the size of the test cell. So, if you tested 5,000 names, then you can roll out that same mailer to up to 50,000 names on that same list.

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1. The roll-out rule says that after a successful direct mail test, you can safely roll out to up to ten times the size of the test cell. So, if you tested 5,000 names, then you can roll out that same mailer to up to 50,000 names on that same list.