We’ve written a lot about IMAP and Apple Mail. We still maintain IMAP is a blessing and essential for any user with more than one computer. Yet Apple Mail still has surprises for us.
In particular, you never know what folder it’s going to choose for sent mail. So it’s very easy to end up with your sent mail and your spam mail scattered across three different folders on as many computers.
There is a craftily hidden command which will let you sort this out ver quickly.