postfix/smtpd: client=unknown[10.5.30.1], sasl_method=PLAIN, sasl_username=prenom.nom
postfix/qmgr: from=<prenom.nom@domain.fr>, size=726, nrcpt=1 (queue active)
postfix/smtpd: disconnect from unknown[10.5.30.1] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8
postfix/local: to=<prenom.nom@domain.fr>, relay=local, delay=24, delays=24/0.01/0/0.05, dsn=5.1.1, status=bounced (unknown user: "prenom")
postfix/qmgr: removed