Ah, I see. Thanks for the reply! I've no idea what kind of communication it's doing with the imap server, there shouldn't be any really. But I suspect the citadel server I'm using is not the best of imap citizens.

I must admit it's a bit of hit and miss for me with the icons.. I can't say I'm confident as to what they indicate, so I hit one and cross fingers (e.g. "did I send the message or discard it?")
But I'll certainly look for the one to open it. I always tried clicking the little envelope to the left of the message, but that didn't do anything, but I didn't think of looking at that row of icons...