My mail forwarding service has recently started adding a "Resent-From" header to all the messages, and I'm trying to filter this out in Mail.app.

I go into Preferences -> Viewing and select "Show message headers: Custom...". The list is initially empty, so I add "From", "To", and "Subject".

When I then view messages, I still see other headers like "Resent-From" and "Reply-to". And if I go back into Preferences and click on that dropdown again, the list of headers is empty again.

How do I get this to work properly?

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