In a guest post on Clayton Makepeace's blog yesterday, Daniel Levis revealed the results of a split test between single and double opt in mailing lists. The results were surprising.

First, he showed how many subscribers each list got, and how many of the original subscribers were still subscribed a year later. Single opt-in won both of these competitions handily (by 37% and 27%). No surprise there.

Then came the interesting stuff -- conversion rates. Here's the data:

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