We would like to A/B test the effect that sending out special offer emails to our database has on open rates and conversions. The best way we can think of is if there was a way to randomly put, for example, 1 in 10 subscribers into a separate static list that can be excluded from special offer emails.
Another way this could be done is if we were able to pull subscribers from a number attribute (for example year of birth) based on ‘number ending with X’ which should give a relatively random selection.