How many recipients should I include in my testing group?
There are no limitations when it comes to the right size of a testing group. Of course, you should have enough people to send the message to and make the test work, e.g. having 4 contacts to test 5 messages wouldn’t be possible.
To achieve statistically relevant information we recommend to have a group of at least 250 recipients per tested message. A handy slider will help you define how many recipients will get the A/B test versions (and divide them into even testing segments automatically), and how many will get the winning version. The test can be performed with up to 50% of the selected recipients.