(unless (notmuch-maildir-fcc-dir-is-maildir-p fcc-header)
(cond ((not (file-writable-p fcc-header))
(error (format "No permission to create %s, which does not exist"
(unless (notmuch-maildir-fcc-dir-is-maildir-p fcc-header)
(cond ((not (file-writable-p fcc-header))
(error (format "No permission to create %s, which does not exist"