hmm, I'm not sure about the mailcheck when clicked, it is supposed to just open claws so just an exit 0 would be ok here I think? (displaying mailbox_empty.png until the next timed update).
The problem I'm having is it always seems returns 0 thus displaying mailbox_empty.png although I do get the new mail count.
(mailbox_full.png does work when i change the exit 0 to exit 1)