Over the last 2 days, I’ve spoken with 3 new customers who send email marketing to lists that range from 100,000 to 500,000 subscribers, and who switched to MailChimp from other providers. 2 of them are e-retailers, and one sells ad space in her monthly newsletters.

They all make money from their email marketing, and they all suffered from declining open rates. None of them did A/B testing at their old email providers, because it was too complicated.

Which is a shame, because we’ve found that those who A/B test their emails get roughly 10% better open rates than those who don’t (see: A/B Split testing – does it help?).

Let’s see. If your list has 100,000 members, and your avg. open rate is 20%, that’s 20,000 opens per campaign.

A/B testers would get roughly 2,000 more opens.

If you could get 10% more opens, and you know your conversion rate, how much more money would that make for your business?

MailChimp’s patent-pending automated A/B testing tool makes it easy. You plug in 2 subjects lines, and that’s it. The system automagically does the rest for you. Best of all, it’s free.