(defun elmo-message-entity-field (entity field &optional decode)
"Get message entity field value.
ENTITY is the message entity structure obtained by `elmo-message-entity'.
FIELD is the symbol of the field name.
if optional DECODE is non-nil, returned value is decoded."
(defun elmo-message-entity-field (entity field &optional decode)
"Get message entity field value.
ENTITY is the message entity structure obtained by `elmo-message-entity'.
FIELD is the symbol of the field name.
if optional DECODE is non-nil, returned value is decoded."