(add-hook 'mu4e-mark-execute-pre-hook
(lambda (mark msg)
(cond ((member mark '(refile trash)) (mu4e-action-retag-message msg "-\\Inbox"))
((equal mark 'flag) (mu4e-action-retag-message msg "\\Starred"))
((equal mark 'unflag) (mu4e-action-retag-message msg "-\\Starred")))))
synclabels = yes
labelsheader = X-Keywords