Hello @AnitaN1 ,
It looks like you already spoke to Chat support, and they've tracked the issue for your case with them. If this issue occurs when scheduling your email, you can make a list from the Did Not Opens, then copy the email, and send that copy to the DNO list.
As far as troubleshooting goes, was this email copied from a previously copied email, or was it copied from a direct source like a reusable template? Or was it created brand new? When you were scheduling the resend, what was the timeframe you set for it?
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