• Write Effective Subject Lines

    The Subject Line Researcher Project The nerds in MailChimp Labs recently unveiled a new experiment called the Subject Line Researcher. It's kind of like Google's Keyword Tool, but for email marketing. And it's free for all MailChimp users. To test your subject line go to the Setup step of the…

  • Set up an A/B Split Campaign

    To set up an A/B Split campaign, click the Create Campaign button from the Dashboard or the Campaigns page in your MailChimp account. Then select the A/B Split Campaign option. On the A/B Split step of the Campaign Builder, we show you the A/B split testing options. You can test…

  • How A/B Split Testing Works

    Use A/B Split Testing To Improve Your Email Marketing Campaigns What's the best day to send your email marketing campaign? Weekdays? Weekends? What time? Early morning, or late afternoon? What kind of subject line works best? Something with a hard sell? Or something more subtle and informative? Will people open…

  • Why We Can’t Stop or Edit Sent Campaigns

    If you've found your way to this article, we know you can't be too happy at the moment. Unfortunately once a campaign has been sent, it cannot be stopped or edited. This includes the final send on A/B Split testing. Once the send button is clicked, we cannot stop the…

  • Test Content with an A/B Split Campaign

    The *|GROUP:X|* Merge Tag helps you run an A/B split test campaign based on your newsletter content where X = A (for Group A) or B (for Group B). Run an A/B split test on your content Set up an A/B split testing campaign by clicking on the Create Campaign…

  • View A/B Test Reports

    To view your A/B split campaign reports go to your Reports tab and click on the title of the A/B split campaign. On the overview page you'll see a link to A/B split results. There we will display a side by side rundown of your campaign's stats. If you have…

  • Choose the Winner of an A/B Split Campaign

    If you want to check out your A/B split campaign stats before the campaign gets sent to the winner, you can choose on the A/B Split step of the Campaign Builder to send to the winning group manually. To view your A/B split campaign reports and pick the winner, go…

  • Can I tell which subscribers are in Groups A & B for an A/B Split campaign?

    No, the A and B groups for A/B split campaigns are random and only tracked for purposes of determining a winner. If you're doing some more complicated testing of campaigns, you can use Hairball, a desktop app we created, to create percentage-based segments of your list.

  • On an A/B split test, which Group is the winner when there are no opens or clicks on the campaign?

    In the event that absolutely no one opens or clicks either your A send or your B send, the final send will go to Group A by default. This may happen if you send your initial Group A and B send to a very small number of recipients. This also…

  • Is an A/B split campaign ever sent to the loser?

    The A/B split campaign will always be sent to the winner at the time you selected the final group to be sent out. Note that when more stats come in for your campaign the winner can change after the final group email has been sent. To avoid this, always make…