Wouldn't that also delete the from my IMAP server (in my case, Gmail)? I'd also be worried about deleting the messages from my [All Mail] folder, which is what

Wouldn't that also delete the from my IMAP server (in my case, Gmail)? I'd also be worried about deleting the messages from my [All Mail] folder, which is what I have a real issue with (my inbox is rarely very large).