Have been using the random sample functionality to send subject line/creative tests for a little while now. We were under the impression that when using random sampling in a single campaign that there would be no overlap between random samples. Found out this week that this is not the case.
For example if you are sending out a subject line test to two 50% random samples, there could be people that receive both subject line tests. What needs to be done to avoid this possibility is to add an additional choice in your request campaign Flow step, "Was Sent Email".
Marketo doesn't allow duplicate Emails to be sent for a particular campaign and has the qualification rule that specifies each lead can run through the flow once, so it was surprising that this scenario could occur.
Has anyone run into issues w/ random sampling sending to the same person twice within a campaign?