I see it looks like people gave up on this a couple years ago, not surprisingly since no action seems to be taken. I would just like to add a dimension to the concept of edting an email before you resend it to people who didn't open. Yes, it may be that you made mistakes in the first email that you want to correct, but even more so it seems to me that when you are re-sending an email several days after it was first sent it is likely that there could be some time-related references that you may want to change to the people getting it later. Maybe the original email announced registration for an event that was open for a week after the send. When you do the resend you might want to change that to something like "Two days left to register!" If you use your imagination you can come up with many different things like that where it would be useful to make small edits, not just a matter of correcting earlier errors. You might even want to add a sentence at the top: "We hope you didn't miss hearing about ________." I don't remember if you can even change the subject line, but IIRC, if you CAN change it, you have to decide what you want the subject line to be when setting up the first send, you can't create the subject line just when you are ready for it to go out. I know you can create a list of people who didn't open the first, and duplicate the email and make your edits, but it's quite a few extra steps, plus it doesn't merge the analytics for the two sends into one report.
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