Remove Duplicate Emails (MacOS 10.13.x)- There has to be a SIMPLE (or painful) way.

Looking identify and remove duplicate messages in Apple Mail boxes. Preferable something that allows selectable criteria for metadata, not just bases the comparison on message ID or subject...

Can any PLEASE help me? 🙂

Over 15 years, I have dozens maybe hundreds of Mbox's. Some duplicates of others and many consolidations of each other.

Either way, I'm really looking for a way to import all of my mail into an archive, which I can search and retrieve as necessary, however more than anything... eliminate the thousands of duplicates. Some have attachments and some don't, however they are duplicates.

Can anyone provide me with suggestions, scripts, purchasable applications, etc? At the most simplistic level, I'd be happy just having one tool that could identify duplicates in a single Mbox and would be happy repeating the process. I just need something that does not based it's duplicate on the mail ID alone, as that tends to change upon importing of merging. IMHO, a good tool would compare Body_Text, Sent_to, Received_From, Attachments (size/name) at a minimum. Perhaps even provide an options for which fields to compare.

Thank you,

Jack