Hi! I use a lot of different IMAP accounts within Thunderbird with the unified inbox view. As a result, I often make a mistake and drag e-mail from the unified inbox to a folder on the "wrong" account (which didn't actually receive the original e-mail). Outlook (which otherwise drove me crazy) would prevent this, but Thunderbird allows it so I end up with e-mails scattered across different accounts which they don't really belong to. This later causes all sorts of problems for me. I understand that for others this flexibility may be a feature, but for me it is not. Is there any sort of setting or add-on which I could use to force Thunderbird to reject an attempt to move an e-mail message outside the original account? Or at least to warn me it's happening? Thanks very much!