Message app doesn't handle groups defined in the Contact app

Hello.

It is not possible to use the groups defined in the Contact app. Neither the "phone" nor "e.email" database groups appear in the Message list of addressees.

It should be great if this feature was available. Indeed, sending one sms/mms to multiple contacts works fine, but for the moment you have to add contacts one by one, whereas some contact groups are defined but useless.