Hello @PikeC ,
This is only possible for internal systems, therefore ESPs such as us cannot do this on a technical nor legal aspect.
If you made a mistake, and did not notice until after the email was already sent out, we'd recommend copying the email, making the edits, changing your subject to reflect the fact it's been edited, and then send that to your list. Additionally, we recommend utilizing the Preview and Test Send functionality to check for errors, and have colleagues check out the email in case they spot something you don't.
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