So then the question becomes how to mass delete those names/emails that haven't opened in a while? My list is large as is the list of did not opens. I'm trying to figure out how to use spreadsheets to accomplish this but haven't had any luck so far. I thought I could download all my contacts in one file and my did not opens in another and then use excel to combine them and then sort so that any contacts in both lists would be sorted as such. Then I could simply delete those lines and reimport the file as a new contacts list. However, I can't figure out how to make that happen.
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