I'd like to split recipients in a series to receive slightly different versions of a message. It's not a test, per se, and I'd like to send a follow-up message for each version of the first message. There's no criteria for who gets which version of the message, it'd just like to split it evenly.
So, an A/B test of the message doesn't seem to be the answer, since I can't tie the follow-up message to the specific version of the first email. A split test block seems like it would do what I want, but I don't want to upgrade just to test it out.
Any ideas?