You want to perform an A/B test on your email. You have 800 recipients in your send list. Which is the best fit for the breakdown of your A/B test?

HubSpot recommends using a 50/50 A/B test when the recipient list is below the recommended size for reserving a winning-version audience. With 800 recipients, splitting the entire audience between version A and version B gives each variation the largest possible sample. This avoids weakening the test by holding back part of a small list for a later winner send. The goal is to compare both email versions with enough recipient data to make the result more useful.