Pour info les denières lignes de mon fichier /var/log/maillog:
Jun 11 16:01:17 snmpsrv1 sendmail[26537]: q5BE1HXZ026537: from=root, size=240, class=0, nrcpts=1, msgid=<201206111401.q5BE1HXZ026537@localhost.localdomain>, relay=root@localhost
Jun 11 16:01:17 snmpsrv1 postfix/smtpd[26166]: connect from snmpsrv1[127.0.0.1]
Jun 11 16:01:17 snmpsrv1 postfix/smtpd[26166]: NOQUEUE: reject: RCPT from snmpsrv1[127.0.0.1]: 550 5.1.1 <mail@domaine.be>: Recipient address rejected: User unknown in local recipient table; from=<root@localhost.localdomain> to=<mail@domaine.be> proto=ESMTP helo=<localhost.localdomain>
Jun 11 16:01:17 snmpsrv1 sendmail[26537]: q5BE1HXZ026537: to=mail@domaine.be, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30240, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown
Jun 11 16:01:17 snmpsrv1 sendmail[26537]: q5BE1HXZ026537: q5BE1HXa026537: DSN: User unknown
Jun 11 16:01:17 snmpsrv1 postfix/smtpd[26166]: CB3E9C19E6: client=snmpsrv1[127.0.0.1]
Jun 11 16:01:17 snmpsrv1 postfix/cleanup[26169]: CB3E9C19E6: message-id=<201206111401.q5BE1HXa026537@localhost.localdomain>
Jun 11 16:01:17 snmpsrv1 postfix/qmgr[25121]: CB3E9C19E6: from=<>, size=2576, nrcpt=1 (queue active)
Jun 11 16:01:17 snmpsrv1 sendmail[26537]: q5BE1HXa026537: to=root, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=31264, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as CB3E9C19E6)
Jun 11 16:01:17 snmpsrv1 postfix/smtp[26170]: CB3E9C19E6: to=<root@localhost.localdomain>, relay=serveur_mail_relay_.domaine.local[xxxx.xxxx.xxxx.xxxx]:25, delay=0.11, delays=0.08/0/0/0.02, dsn=2.0.0, status=sent (250 Message accepted for delivery)
Jun 11 16:01:17 snmpsrv1 postfix/qmgr[25121]: CB3E9C19E6: removed
Jun 11 16:01:18 snmpsrv1 postfix/smtpd[26166]: disconnect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 sendmail[27170]: q5BE1gO3027170: from=nagios, size=408, class=0, nrcpts=1, msgid=<201206111401.q5BE1gO3027170@localhost.localdomain>, relay=nagios@localhost
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: connect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: 50B17C19E6: client=snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/cleanup[26169]: 50B17C19E6: message-id=<201206111401.q5BE1gO3027170@localhost.localdomain>
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: 50B17C19E6: from=<nagios@localhost.localdomain>, size=882, nrcpt=1 (queue active)
Jun 11 16:01:42 snmpsrv1 sendmail[27170]: q5BE1gO3027170: to=$, ctladdr=nagios (501/501), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30408, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 50B17C19E6)
Jun 11 16:01:42 snmpsrv1 postfix/smtp[26170]: 50B17C19E6: to=<$@localhost.localdomain>, relay=serveur_mail_relay_.domaine.local[xxxx.xxxx.xxxx.xxxx]:25, delay=0.11, delays=0.09/0/0/0.02, dsn=2.0.0, status=sent (250 Message accepted for delivery)
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: 50B17C19E6: removed
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: disconnect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 sendmail[27175]: q5BE1geM027175: from=nagios, size=400, class=0, nrcpts=1, msgid=<201206111401.q5BE1geM027175@localhost.localdomain>, relay=nagios@localhost
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: connect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: 98983C19E6: client=snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/cleanup[26169]: 98983C19E6: message-id=<201206111401.q5BE1geM027175@localhost.localdomain>
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: 98983C19E6: from=<nagios@localhost.localdomain>, size=874, nrcpt=1 (queue active)
Jun 11 16:01:42 snmpsrv1 sendmail[27175]: q5BE1geM027175: to=$, ctladdr=nagios (501/501), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30400, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 98983C19E6)
Jun 11 16:01:42 snmpsrv1 postfix/smtp[26170]: 98983C19E6: to=<$@localhost.localdomain>, relay=serveur_mail_relay_.domaine.local[xxxx.xxxx.xxxx.xxxx]:25, delay=0.1, delays=0.08/0/0/0.02, dsn=2.0.0, status=sent (250 Message accepted for delivery)
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: 98983C19E6: removed
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: disconnect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 sendmail[27180]: q5BE1gNG027180: from=nagios, size=400, class=0, nrcpts=1, msgid=<201206111401.q5BE1gNG027180@localhost.localdomain>, relay=nagios@localhost
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: connect from snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: D293EC19E6: client=snmpsrv1[127.0.0.1]
Jun 11 16:01:42 snmpsrv1 postfix/cleanup[26169]: D293EC19E6: message-id=<201206111401.q5BE1gNG027180@localhost.localdomain>
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: D293EC19E6: from=<nagios@localhost.localdomain>, size=874, nrcpt=1 (queue active)
Jun 11 16:01:42 snmpsrv1 sendmail[27180]: q5BE1gNG027180: to=$, ctladdr=nagios (501/501), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30400, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as D293EC19E6)
Jun 11 16:01:42 snmpsrv1 postfix/smtp[26170]: D293EC19E6: to=<$@localhost.localdomain>, relay=serveur_mail_relay_.domaine.local[xxxx.xxxx.xxxx.xxxx]:25, delay=0.09, delays=0.07/0/0/0.02, dsn=2.0.0, status=sent (250 Message accepted for delivery)
Jun 11 16:01:42 snmpsrv1 postfix/qmgr[25121]: D293EC19E6: removed
Jun 11 16:01:42 snmpsrv1 postfix/smtpd[26166]: disconnect from snmpsrv1[127.0.0.1]
Et sendmail est bien désactivé...