Hello @IsabelleH95 ,
If you're wanting to see which of your existing contacts opened a previous email, you have a couple options.
The simplest is to just view the reporting for the previous email.
If you want to be particularly precise on who was sent/opened/clicked in the previous email, and is a member of the list you're about to send the new one to, you can create a segment with the criteria of:
List Membership > Is > the list you're going to send to
AND
Email Activities > Sent > a Specific Email > the old email campaign
You can then repeat this process for additional segments, swapping out the "Sent" activity criteria for opens, clicks, etc.
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