I do this all the time. 😅 I first saw the idea on one of Lee’s slides. I change the subject line a little so I can experiment with that, too, and I also test different send dates and times. For example, the original might go out on a Saturday afternoon, and the resend might go out on Tuesday morning. I usually get around 150 extra opens from it, from a list of about 2,500 people, and I always get sales from the resend. 😁 (Just be careful to update anything time-specific—like “have a great weekend”—before you resend. 🙈)