Thank you for your reply to an earlier question.
I imported a mailbox in to EF and got many many errors about missing attachments. I did not have my Apple Mail client set to download attachments until yesterday. But before importing the mailbox, I created a smart mailbox of emails having attachments, and laboriously opened all of them except the ones that I had sent. When I highlight one of the error emails, and option click “Reveal” it just opens a strangely formatted copy of the email with loads of gibberish, but does not reveal it in the finder, which I thought it was supposed to do.
I was going to try the method you mention of option dragging the mailbox to “On my Mac” to make it download attachments, but I cannot do this. The mailbox refuses to be dropped there. Any idea what I’m doing wrong? Thanks.