TAG	NOM	OBLIGATOIRE	REPETITION
X926	Syntax version number	Oui	1
C900	Sender identification	Oui	1
X921	Sender domain address	Oui	1
X922	Sender user address	Non	1
X927	Sender type, coded	Non	1
C905	Recipient identification	Oui	1
X923	Recipient domain address	Oui	1
X924	Recipient user address	Non	1
X928	Recipient type, coded	Non	1
X925	Group type	Non	1