I want to select multiple messages in a Mail.app folder by hand, do X, and then have a new mail message window appear with all those senders in the "To:" or "Bcc:" field. What is that magical X option?
Is it even built in, or do I need to find\write some Applescript? It looks like Automator doesn't have actions to grab senders from mail messages, so that's no way forward.
I am blown away that this is not as simple as selecting the messages and hitting reply. (It's greyed out, if you try.) I found this discussion about the same problem, but there was no real answer offered besides "try another email client" and "create rules for incoming mail that auto-replies". Terrible!