I am a compulsive email archivist, and have a complex web of folder on my IMAP server where I squirrel away almost anything remotely of interest. As a result I do a lot of dragging-and-dropping inside the Mail.app application that I use to read my email most of the time.
What happens half the time I do this is that instead of dragging-and-dropping the message I’m clicking on, the application goes into “select multiple messages” mode, and I get frustrated.
This morning, however, I discovered the secret for avoiding this: click and hold on the messages you want to drag and drop. After a moment the message highlighting will change, signaling “drag-ready” status. At that point you’re good to go.
Not ready for drag and drop:
Ready for drag and drop:
Maybe everyone else has always known about this, but I didn’t, and coming to realize it has made my emailing much less frustrating.