(elmo-shimbun-folder-shimbun-internal folder))
(when (and (elmo-folder-plugged-p folder)
(elmo-shimbun-headers-check-p folder))
(elmo-shimbun-folder-shimbun-internal folder))
(when (and (elmo-folder-plugged-p folder)
(elmo-shimbun-headers-check-p folder))