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Bonjour, Je découvre le contenu suivant dans mon fichier : /var/log/messages Aug 18 18:23:50 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 18 18:23:53 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown ........(idem pendant 30 mn) Aug 18 18:53:17 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 18 18:53:21 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 18 18:53:29 dovecot: auth-worker(default): pam(guest,82.243.132.145): pam_acct_mgmt() failed: Permission denied Aug 18 18:55:44 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 18 18:55:48 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown ........( idem pendant 22 mn) Aug 19 12:17:07 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 19 12:17:10 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown Aug 20 17:14:57 postfix/smtpd[15669]: warning: Connection concurrency limit exceeded: 51 from mail.presbyhomesinc.org[168.215.117.210] for service smtp Aug 20 17:14:57 postfix/smtpd[15670]: warning: Connection concurrency limit exceeded: 51 from mail.presbyhomesinc.org[168.215.117.210] for service smtp .............(répété une vingtaine de fois) Aug 20 17:14:57 postfix/smtpd[15674]: warning: Connection concurrency limit exceeded: 51 from mail.presbyhomesinc.org[168.215.117.210] for service smtp Aug 21 00:00:02 ntpdate: Sync with time server 88.191.120.99 offset 0.656589 sec. Aug 21 16:28:51 postfix/smtpd[20704]: warning: non-SMTP command from ns206479.ovh.net[94.23.52.33]: GET / HTTP/1.1 Aug 21 22:53:28 postfix/smtpd[22082]: warning: non-SMTP command from vps378.zoner-asiakas.fi[84.34.190.228]: GET / HTTP/1.1 Aug 22 23:03:57 postfix/smtpd[27774]: warning: 115.81.18.86: hostname 115-81-18-86.taiwanmobile.net verification failed: Name or service not known Aug 22 23:03:59 postfix/smtpd[27774]: warning: 115.81.18.86: hostname 115-81-18-86.taiwanmobile.net verification failed: Name or service not known Manifestement on a voulu s'attaquer à Mail Station, sans succès cette fois mais jusqu'à quand ? Les adresses IP n'ont pas été bloquées ! Les lignes en rouge m'inquiètent. J'ai bloqué le port smtp, mais cela ne règlera pas le problème avec dovecot. Je ne puis, sauf arrêter Mail Station bloquer le port POP3. J'attends les résultats de l'analyse des experts et leurs suggestions. Je prècise que je n'ai eu aucun message système. Cordialement. Michel.