Hello @Diaconate-Institute ,
If you're wanting to see the explicit last time a contact opened an email, you'd need to do this on an individual basis by looking at the specific contact's email engagement activity.
Otherwise, you can segment contacts based on open criteria, to sort out contacts that have never opened an email, haven't opened your previous email, haven't opened an email in a set period of time, etc. Otherwise you can also use our pre-built least engaged segment.
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