Hi @Dougers1 ,
If you like filter out a certain column of records in Excel whose values are not empty and send email to the relevant people.
Please try this:

The Expression of empty:
empty(items('Apply_to_each')?['ColumnName'])
Hope this helps you!
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If my answer solves your problem, please accept it as a solution to help more people stuck on the same problem find it.
Best regards,
Rimmon Li