in "/var/log/maillog" i find informations like that :
Nov 17 02:38:23 lnxinnofr02 pop3-login: Login:
thierry.rocha@euchner.fr [::ffff:90.84.146.219]
Nov 17 02:38:38 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:38:38 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:38:53 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:38:53 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:39:08 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:39:08 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:39:18 lnxinnofr02 pop3-login: Login:
apoisson@antarisconsult.com [::ffff:178.239.84.240]
Nov 17 02:39:23 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:39:23 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:39:38 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:39:38 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:39:53 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:39:53 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:39:59 lnxinnofr02 pop3-login: Login:
mbetti@betti.fr [::ffff:90.2.84.203]
Nov 17 02:39:59 lnxinnofr02 pop3-login: Login:
gbetti@betti.fr [::ffff:90.2.84.203]
Nov 17 02:39:59 lnxinnofr02 pop3-login: Login:
mrobert@betti.fr [::ffff:90.2.84.203]
Nov 17 02:40:00 lnxinnofr02 pop3-login: Login:
betti@betti.fr [::ffff:90.2.84.203]
Nov 17 02:40:08 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:40:08 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:40:23 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:40:23 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MSA: load average: 65
Nov 17 02:40:38 lnxinnofr02 sendmail[28764]: rejecting connections on daemon MTA: load average: 65
Nov 17 02:40:38 lnxinnofr02 sendmail[28764]: rejecting connect