If you use LastPass and Kit especially check your subject lines before you hit send. There was an update last week on the LastPass extension and my email was being auto filled into the subject lines.
One of my coaches sent an email out this morning with her email as the subject line π You can change LastPass settings so that you have to click the icon to fill, to fix the issue. I've got on my to do list to double check all the sequences I worked on last week π€ͺ that was how I caught it initially