Receive message box during individual message download
It would be nice to have a message box displayed when a relatively large message is downloaded from an IMAP folder (i.e. during the time when the message is received from the IMAP server to the local computer). As it is now you just have to stare at the frozen GUI and you have no visual feedback about what's going on during the download process.
The same is true when downloading a message from a POP server when you click download from the POP3 remote mail window.
In brief, a message box displaying the download progress should be displayed when downloading an INDIVIDUAL message, just the way it is displayed when you download all the messages from a POP3 server.