A) Please post exact version of Plesk.
Version is 11.0.9 Update #54, last updated at June 16, 2013 06:37 AM
B) Check /usr/local/psa/var/log/maillog .
Hello,
here is the last Part of the Logfile:
Jun 27 07:32:58 Illiminator /var/qmail/bin/relaylock[12471]: /var/qmail/bin/relaylock: mail from 85.25.131.98:52859 (bravo400.server4you.de)
Jun 27 08:04:32 Illiminator /var/qmail/bin/relaylock[12864]: /var/qmail/bin/relaylock: mail from 80.150.215.98:59222 (not defined)
Jun 27 08:32:27 Illiminator /var/qmail/bin/relaylock[13151]: /var/qmail/bin/relaylock: mail from 95.130.121.84:47852 (umvi121wt84.content-container.de)
Jun 27 09:00:08 Illiminator /var/qmail/bin/relaylock[13235]: /var/qmail/bin/relaylock: mail from 91.229.179.48:53636 (mail20-48.srv2.de)
Jun 27 09:12:25 Illiminator /var/qmail/bin/relaylock[13275]: /var/qmail/bin/relaylock: mail from 91.229.178.95:37894 (mail19-95.srv2.de)
Jun 27 10:05:59 Illiminator imapd: Connection, ip=[::ffff:127.0.0.1]
Jun 27 10:06:04 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:09 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:14 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:19 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:24 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:29 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:29 Illiminator imapd: 1372320389.108608 LOGOUT, ip=[::ffff:127.0.0.1], rcvd=17, sent=98, maildir=/etc/init.d
Jun 27 10:06:43 Illiminator imapd: Connection, ip=[::ffff:127.0.0.1]
Jun 27 10:06:48 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:53 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:06:58 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:07:03 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:07:08 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:07:13 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:07:13 Illiminator imapd: 1372320433.105325 LOGOUT, ip=[::ffff:127.0.0.1], rcvd=17, sent=98, maildir=/etc/init.d
Jun 27 10:12:51 Illiminator /var/qmail/bin/relaylock[13633]: /var/qmail/bin/relaylock: mail from 91.229.178.97:36680 (mail19-97.srv2.de)
Jun 27 10:19:42 Illiminator /var/qmail/bin/relaylock[13686]: /var/qmail/bin/relaylock: mail from 91.194.249.204:57282 (e3pmta204.emarsys.net)
Jun 27 10:22:12 Illiminator imapd: Connection, ip=[::ffff:127.0.0.1]
Jun 27 10:22:17 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:22:22 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:22:28 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:22:33 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:22:38 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Jun 27 10:22:43 Illiminator imapd: IMAP connect from @ [::ffff:127.0.0.1]ERR: LOGIN FAILED, ip=[::ffff:127.0.0.1]
Ahm, just found that at the beginn of the Log:
Jun 27 06:26:01 Illiminator spamd[386]: spamd: server killed by SIGTERM, shutting down
Jun 27 06:26:02 Illiminator spamd[12141]: logger: removing stderr method
Jun 27 06:26:03 Illiminator spamd[12143]: spamd: server started on UNIX domain socket /tmp/spamd_full.sock (running version 3.3.2)
Jun 27 06:26:03 Illiminator spamd[12143]: spamd: server pid: 12143
Jun 27 06:26:03 Illiminator spamd[12143]: spamd: server successfully spawned child process, pid 12145
Jun 27 06:26:03 Illiminator spamd[12143]: spamd: server successfully spawned child process, pid 12147
Jun 27 06:26:03 Illiminator spamd[12143]: prefork: child states: IS
Jun 27 06:26:03 Illiminator spamd[12143]: prefork: child states: II
Maybe this SIGTERM a Problem?