As I've said, I'm at least planning on moving from BlueMail to Thunderbird (which I've been using on my PC for ages). But in the couple of days I've been experimenting with it, I've now found a second problem. It seems that when I download something from the server, it's no longer available for download elsewhere. BlueMail deletes from server when you delete your trash. PC is set to delete on download. Can't find a way to set this on Android version.