As i said, I am beginner and i didn't get the difference between Dovecot and Courier. In ISPConfig3 there is an option to chose this, so when one thing didnt work i tried with another. Believe me that I am more confused then you.
Anyhow, I realy respect that you answered me.
Here is what you asked:
Active Internet connections (servers and established)
netstat -tap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 *:http-alt *:* LISTEN 2711/apache2
tcp 0 0 *:www *:* LISTEN 2711/apache2
tcp 0 0 *:webmin *:* LISTEN 1614/perl
tcp 0 0 *:tproxy *:* LISTEN 2711/apache2
tcp 0 0 *:ftp *:* LISTEN 2625/pure-ftpd (SER
tcp 0 0 server.local:domain *:* LISTEN 1692/named
tcp 0 0 localhost:domain *:* LISTEN 1692/named
tcp 0 0 *:ssh *:* LISTEN 889/sshd
tcp 0 0 *:1143 *:* LISTEN 2723/imapproxyd
tcp 0 0 localhost:ipp *:* LISTEN 1015/cupsd
tcp 0 0 localhost

ostgresql *:* LISTEN 1876/postgres
tcp 0 0 *:smtp *:* LISTEN 2600/master
tcp 0 0 localhost:953 *:* LISTEN 1692/named
tcp 0 0 *:https *:* LISTEN 2711/apache2
tcp 0 0 *:ldap *:* LISTEN 1944/slapd
tcp 0 0 localhost:10024 *:* LISTEN 1839/amavisd (maste
tcp 0 0 localhost:10025 *:* LISTEN 2600/master
tcp 0 0 *:mysql *:* LISTEN 1216/mysqld
tcp 0 0 server.local:37496 2.20.181.97:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:55319 ec2-107-22-178-29.c:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:55320 ec2-107-22-178-29.c:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:54150 80-239-148-95.custo:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:39114 muc03s02-in-f6.1e10:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:46217 muc03s02-in-f13.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:60685 www-slb-11-02-ash3.:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35400 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 localhost:10025 localhost:38172 ESTABLISHED 2731/smtpd
tcp 0 0 localhost:42538 localhost:mysql TIME_WAIT -
tcp 0 0 server.local:54309 muc03s02-in-f2.1e10:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:47708 muc03s02-in-f26.1:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:55322 ec2-107-22-178-29.c:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:46019 muc03s02-in-f23.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35399 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:35398 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 localhost:38172 localhost:10025 ESTABLISHED 1881/amavisd (ch1-a
tcp 0 0 server.local:54149 80-239-148-95.custo:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35401 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:57248 muc03s02-in-f25.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:37971 2.21.93.231:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:55321 ec2-107-22-178-29.c:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35402 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:44308 2.21.88.74:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:58369 205.251.72.172:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35403 muc03s02-in-f6.1e:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:36338 muc03s02-in-f3.1e:https ESTABLISHED 3109/firefox
tcp 0 0 server.local:39311 muc03s02-in-f26.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:54998 157.55.117.16:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:35751 aidps.msn.com:www ESTABLISHED 3109/firefox
tcp 0 0 localhost:mysql localhost:42536 ESTABLISHED 1216/mysqld
tcp 0 0 localhost:42536 localhost:mysql ESTABLISHED 1881/amavisd (ch1-a
tcp 0 0 server.local:60803 2.21.111.139:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:48742 80-239-148-78.custo:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:38850 muc03s02-in-f27.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:57239 muc03s02-in-f25.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:38850 muc03s02-in-f27.1e1:www ESTABLISHED 3109/firefox
tcp 0 0 server.local:43879 ec2-176-34-132-201.:www ESTABLISHED -
tcp 0 0 server.local:57239 muc03s02-in-f25.1e1:www ESTABLISHED 3109/firefox
tcp6 0 0 [::]

op3 [::]:* LISTEN 2464/couriertcpd
tcp6 0 0 [::]:imap2 [::]:* LISTEN 2410/couriertcpd
tcp6 0 0 [::]:ftp [::]:* LISTEN 2625/pure-ftpd (SER
tcp6 0 0 [::]:domain [::]:* LISTEN 1692/named
tcp6 0 0 [::]:ssh [::]:* LISTEN 889/sshd
tcp6 0 0 ip6-localhost:ipp [::]:* LISTEN 1015/cupsd
tcp6 0 0 ip6-localhost:953 [::]:* LISTEN 1692/named
tcp6 0 0 [::]:imaps [::]:* LISTEN 2432/couriertcpd
tcp6 0 0 [::]

op3s [::]:* LISTEN 2486/couriertcpd
tcp6 0 0 [::]:ldap [::]:* LISTEN 1944/slapd
and here is last part of errors asked, i did something in between so i probably changed from time to time:
Apr 11 18:05:12 server postfix/postqueue[2226]: warning: Mail system is down -- accessing queue directly
Apr 11 20:05:22 server authdaemond: modules="authpam", daemons=5
Apr 11 20:05:22 server authdaemond: Installing libauthpam
Apr 11 20:05:22 server authdaemond: Installation complete: authpam
Apr 11 20:05:25 server postfix/master[2600]: daemon started -- version 2.8.5, configuration /etc/postfix
Apr 11 20:05:25 server postfix/qmgr[2605]: 2185B6213D3: from=<root@server.home>, size=1027, nrcpt=1 (queue active)
Apr 11 20:05:25 server postfix/qmgr[2605]: 231B16213CA: from=<root@server.home>, size=1039, nrcpt=1 (queue active)
Apr 11 20:05:25 server postfix/pickup[2604]: 5D1B5620157: uid=0 from=<root>
Apr 11 20:05:25 server postfix/cleanup[2615]: 5D1B5620157: message-id=<20120411180525.5D1B5620157@server.home>
Apr 11 20:05:25 server postfix/qmgr[2605]: 5D1B5620157: from=<root@server.home>, size=819, nrcpt=1 (queue active)
Apr 11 20:05:25 server dovecot: lda: Fatal: Plugin 'sieve' not found from directory /usr/lib/dovecot/modules
Apr 11 20:05:25 server dovecot: lda: Fatal: Plugin 'sieve' not found from directory /usr/lib/dovecot/modules
Apr 11 20:05:26 server postfix/pipe[2621]: 231B16213CA: to=<testmail@mail.home>, relay=dovecot, delay=97508, delays=97507/0.26/0/0.47, dsn=4.3.0, status=deferred (temporary failure)
Apr 11 20:05:26 server postfix/pipe[2619]: 2185B6213D3: to=<test@mail.home>, relay=dovecot, delay=87383, delays=87382/0.51/0/0.5, dsn=4.3.0, status=deferred (temporary failure)
Apr 11 20:05:28 server in.imapproxyd[2718]: No syslog priority mask specified.
Apr 11 20:05:28 server in.imapproxyd[2718]: main(): SELECT caching is disabled
Apr 11 20:05:28 server in.imapproxyd[2718]: main(): Internal admin commands are disabled
Apr 11 20:05:28 server in.imapproxyd[2718]: main(): Allocating 3072 IMAP connection structures.
Apr 11 20:05:28 server in.imapproxyd[2718]: ServerInit(): Using '/var/log/imapproxy_protocol.log' for global protocol logging file.
Apr 11 20:05:28 server in.imapproxyd[2718]: ServerInit(): proxying to IMAP server 'localhost'.
Apr 11 20:05:28 server in.imapproxyd[2718]: ServerInit(): Proxying to IMAP port 143
Apr 11 20:05:28 server imapd: Connection, ip=[::ffff:127.0.0.1]
Apr 11 20:05:28 server imapd: Connection, ip=[::ffff:127.0.0.1]
Apr 11 20:05:28 server in.imapproxyd[2718]: main(): Binding to tcp *:1143
Apr 11 20:05:28 server in.imapproxyd[2718]: main(): Using global statistics file '/var/run/pimpstats'
Apr 11 20:05:28 server in.imapproxyd[2718]: Daemonize(): Configured to run in background mode.
Apr 11 20:05:28 server imapd: Disconnected, ip=[::ffff:127.0.0.1], time=0
Apr 11 20:05:28 server imapd: LOGOUT, ip=[::ffff:127.0.0.1], rcvd=24, sent=464
Apr 11 20:05:28 server in.imapproxyd[2723]: BecomeNonRoot(): Process will run as uid 65534 (nobody) and gid 65534 (nogroup).
Apr 11 20:05:28 server in.imapproxyd[2723]: BecomeNonRoot(): Process chrooted in /var/lib/imapproxy/chroot
Apr 11 20:05:28 server in.imapproxyd[2723]: main(): Launched ICC recycle thread with id 313906944
Apr 11 20:05:28 server in.imapproxyd[2723]: main(): imapproxy version 1.2.7 normal server startup.
Apr 11 20:05:28 server postfix/smtpd[2731]: cannot load Certificate Authority data: disabling TLS support
Apr 11 20:05:28 server postfix/smtpd[2731]: warning: TLS library problem: 2731:error:02001002:system library:fopen:No such file or directory:bss_file.c:169:fopen('/etc/ssl/certs/cacert.pem','r'):
Apr 11 20:05:28 server postfix/smtpd[2731]: warning: TLS library problem: 2731:error:2006D080:BIO routines:BIO_new_file:no such file:bss_file.c:172:
Apr 11 20:05:28 server postfix/smtpd[2731]: warning: TLS library problem: 2731:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:by_file.c:274:
Apr 11 20:05:28 server postfix/smtpd[2731]: connect from localhost[127.0.0.1]
Apr 11 20:05:28 server postfix/smtpd[2731]: AA8C06215B2: client=localhost[127.0.0.1]
Apr 11 20:05:28 server postfix/cleanup[2615]: AA8C06215B2: message-id=<20120411180525.5D1B5620157@server.home>
Apr 11 20:05:28 server postfix/qmgr[2605]: AA8C06215B2: from=<root@server.home>, size=1238, nrcpt=1 (queue active)
Apr 11 20:05:28 server amavis[1881]: (01881-01) Passed CLEAN, <root@server.home> -> <root@server.home>, Message-ID: <20120411180525.5D1B5620157@server.home>, mail_id: H9DrTQSCiMkd, Hits: 0.378, size: 819, queued_as: AA8C06215B2, 2895 ms
Apr 11 20:05:28 server postfix/smtp[2620]: 5D1B5620157: to=<root@server.home>, orig_to=<root>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=14/0.44/0.02/2.9, dsn=2.0.0, status=sent (250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as AA8C06215B2)
Apr 11 20:05:28 server postfix/qmgr[2605]: 5D1B5620157: removed
Apr 11 20:05:28 server postfix/local[2733]: AA8C06215B2: to=<root@server.home>, relay=local, delay=0.24, delays=0.14/0.03/0/0.07, dsn=2.0.0, status=sent (delivered to command: procmail -a "$EXTENSION")
Apr 11 20:05:28 server postfix/qmgr[2605]: AA8C06215B2: removed
Apr 11 20:10:02 server imapd: Connection, ip=[::ffff:127.0.0.1]
Apr 11 20:10:02 server imapd: Disconnected, ip=[::ffff:127.0.0.1], time=0
Apr 11 20:10:02 server pop3d: Connection, ip=[::ffff:127.0.0.1]
Apr 11 20:10:02 server pop3d: Disconnected, ip=[::ffff:127.0.0.1]
Apr 11 20:10:02 server postfix/smtpd[3464]: cannot load Certificate Authority data: disabling TLS support
Apr 11 20:10:02 server postfix/smtpd[3464]: warning: TLS library problem: 3464:error:02001002:system library:fopen:No such file or directory:bss_file.c:169:fopen('/etc/ssl/certs/cacert.pem','r'):
Apr 11 20:10:02 server postfix/smtpd[3464]: warning: TLS library problem: 3464:error:2006D080:BIO routines:BIO_new_file:no such file:bss_file.c:172:
Apr 11 20:10:02 server postfix/smtpd[3464]: warning: TLS library problem: 3464:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:by_file.c:274:
Apr 11 20:10:02 server postfix/smtpd[3464]: connect from localhost[127.0.0.1]
Apr 11 20:10:02 server postfix/smtpd[3464]: lost connection after CONNECT from localhost[127.0.0.1]
Apr 11 20:10:02 server postfix/smtpd[3464]: disconnect from localhost[127.0.0.1]
Apr 11 20:10:02 server postfix/pickup[2604]: CDF4A6215B2: uid=0 from=<root>
Apr 11 20:10:02 server postfix/cleanup[3486]: CDF4A6215B2: message-id=<20120411181002.CDF4A6215B2@server.home>
Apr 11 20:10:02 server postfix/qmgr[2605]: CDF4A6215B2: from=<root@server.home>, size=819, nrcpt=1 (queue active)
Apr 11 20:10:03 server postfix/smtpd[3490]: cannot load Certificate Authority data: disabling TLS support
Apr 11 20:10:03 server postfix/smtpd[3490]: warning: TLS library problem: 3490:error:02001002:system library:fopen:No such file or directory:bss_file.c:169:fopen('/etc/ssl/certs/cacert.pem','r'):
Apr 11 20:10:03 server postfix/smtpd[3490]: warning: TLS library problem: 3490:error:2006D080:BIO routines:BIO_new_file:no such file:bss_file.c:172:
Apr 11 20:10:03 server postfix/smtpd[3490]: warning: TLS library problem: 3490:error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib:by_file.c:274:
Apr 11 20:10:03 server postfix/smtpd[3490]: connect from localhost[127.0.0.1]
Apr 11 20:10:03 server postfix/smtpd[3490]: 0991C620157: client=localhost[127.0.0.1]
Apr 11 20:10:03 server postfix/cleanup[3486]: 0991C620157: message-id=<20120411181002.CDF4A6215B2@server.home>
Apr 11 20:10:03 server postfix/qmgr[2605]: 0991C620157: from=<root@server.home>, size=1238, nrcpt=1 (queue active)
Apr 11 20:10:03 server amavis[1882]: (01882-01) Passed CLEAN, <root@server.home> -> <root@server.home>, Message-ID: <20120411181002.CDF4A6215B2@server.home>, mail_id: Pd4lZCjUPla2, Hits: 0.378, size: 819, queued_as: 0991C620157, 212 ms
Apr 11 20:10:03 server postfix/smtp[3487]: CDF4A6215B2: to=<root@server.home>, orig_to=<root>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.4, delays=0.16/0.01/0.01/0.22, dsn=2.0.0, status=sent (250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 0991C620157)
Apr 11 20:10:03 server postfix/qmgr[2605]: CDF4A6215B2: removed
Apr 11 20:10:03 server postfix/local[3491]: 0991C620157: to=<root@server.home>, relay=local, delay=0.18, delays=0.07/0.03/0/0.07, dsn=2.0.0, status=sent (delivered to command: procmail -a "$EXTENSION")
Apr 11 20:10:03 server postfix/qmgr[2605]: 0991C620157: removed
Apr 11 20:10:28 server postfix/smtpd[2731]: timeout after END-OF-MESSAGE from localhost[127.0.0.1]
Apr 11 20:10:28 server postfix/smtpd[2731]: disconnect from localhost[127.0.0.1]
This is last excerpt after I boot the computer right now few minutes ago.
Thanks.
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