hubot@hubot-vps:~$ sudo tail -n 50 /var/log/syslog
May 20 18:55:07 hubot-vps postfix/qmgr[12183]: 369ED80B84: removed
May 20 18:58:25 hubot-vps postfix/anvil[13737]: statistics: max connection rate 1/60s for (smtp:74.208.4.200) at May 20 18:55:03
May 20 18:58:25 hubot-vps postfix/anvil[13737]: statistics: max connection count 1 for (smtp:74.208.4.200) at May 20 18:55:03
May 20 18:58:25 hubot-vps postfix/anvil[13737]: statistics: max cache size 1 at May 20 18:55:03
May 20 18:58:34 hubot-vps postfix/smtpd[13787]: connect from unknown[103.17.108.72]
May 20 18:58:35 hubot-vps postfix/smtpd[13787]: disconnect from unknown[103.17.108.72]
May 20 18:59:25 hubot-vps postfix/smtpd[13787]: warning: hostname static.vnpt.vn does not resolve to address 123.16.147.49
May 20 18:59:25 hubot-vps postfix/smtpd[13787]: connect from unknown[123.16.147.49]
May 20 18:59:28 hubot-vps postfix/smtpd[13787]: NOQUEUE: reject: RCPT from unknown[123.16.147.49]: 454 4.7.1 <w0e4i3g1h0t5watchers@b15fa0.xehacho.fr>: Relay access denied; from=<kfurkddaq@static.vnpt.vn> to=<w0e4i3g1h0t5watchers@b15fa0.xehacho.fr> proto=ESMTP helo=<static.vnpt.vn>
May 20 18:59:34 hubot-vps postfix/smtpd[13787]: disconnect from unknown[123.16.147.49]
May 20 19:00:01 hubot-vps CRON[13859]: (root) CMD (znc)
May 20 19:00:01 hubot-vps postfix/pickup[13772]: E7F8C80B83: uid=0 from=<root>
May 20 19:00:01 hubot-vps postfix/cleanup[13863]: E7F8C80B83: message-id=<20170520170001.E7F8C80B83@mail.hubot.pl>
May 20 19:00:01 hubot-vps postfix/qmgr[12183]: E7F8C80B83: from=<root@hubot.pl>, size=687, nrcpt=1 (queue active)
May 20 19:00:01 hubot-vps dovecot: lmtp(13867): Connect from local
May 20 19:00:01 hubot-vps dovecot: auth: Warning: sql: Ignoring changed user_query in /etc/dovecot/dovecot-sql.conf, because userdb sql not used. (If this is intentional, set userdb_warning_disable=yes)
May 20 19:00:01 hubot-vps dovecot: auth: Error: prefetch(hubot@hubot.pl): userdb lookup not possible with only userdb prefetch
May 20 19:00:01 hubot-vps postfix/lmtp[13866]: E7F8C80B83: to=<hubot@hubot.pl>, orig_to=<root>, relay=mail.hubot.pl[private/dovecot-lmtp], delay=0.06, delays=0.01/0.01/0.02/0.02, dsn=5.1.1, status=bounced (host mail.hubot.pl[private/dovecot-lmtp] said: 550 5.1.1 <hubot@hubot.pl> User doesn't exist: hubot@hubot.pl (in reply to RCPT TO command))
May 20 19:00:01 hubot-vps dovecot: lmtp(13867): Disconnect from local: Successful quit
May 20 19:00:02 hubot-vps postfix/cleanup[13863]: F418680B84: message-id=<20170520170001.F418680B84@mail.hubot.pl>
May 20 19:00:02 hubot-vps postfix/qmgr[12183]: F418680B84: from=<>, size=2671, nrcpt=1 (queue active)
May 20 19:00:02 hubot-vps dovecot: lmtp(13867): Connect from local
May 20 19:00:02 hubot-vps dovecot: auth: Error: prefetch(hubot@hubot.pl): userdb lookup not possible with only userdb prefetch
May 20 19:00:02 hubot-vps postfix/bounce[13871]: E7F8C80B83: sender non-delivery notification: F418680B84
May 20 19:00:02 hubot-vps postfix/qmgr[12183]: E7F8C80B83: removed
May 20 19:00:02 hubot-vps postfix/lmtp[13866]: F418680B84: to=<hubot@hubot.pl>, orig_to=<root@hubot.pl>, relay=mail.hubot.pl[private/dovecot-lmtp], delay=0, delays=0/0/0/0, dsn=5.1.1, status=bounced (host mail.hubot.pl[private/dovecot-lmtp] said: 550 5.1.1 <hubot@hubot.pl> User doesn't exist: hubot@hubot.pl (in reply to RCPT TO command))
May 20 19:00:02 hubot-vps dovecot: lmtp(13867): Disconnect from local: Successful quit
May 20 19:00:02 hubot-vps postfix/qmgr[12183]: F418680B84: removed
May 20 19:02:55 hubot-vps postfix/anvil[13789]: statistics: max connection rate 1/60s for (smtp:103.17.108.72) at May 20 18:58:34
May 20 19:02:55 hubot-vps postfix/anvil[13789]: statistics: max connection count 1 for (smtp:103.17.108.72) at May 20 18:58:34
May 20 19:02:55 hubot-vps postfix/anvil[13789]: statistics: max cache size 2 at May 20 18:59:25
May 20 19:09:01 hubot-vps CRON[14055]: (root) CMD (  [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean)
May 20 19:10:01 hubot-vps CRON[14102]: (root) CMD (znc)
May 20 19:10:01 hubot-vps postfix/pickup[13772]: 1D0C280B83: uid=0 from=<root>
May 20 19:10:01 hubot-vps postfix/cleanup[14106]: 1D0C280B83: message-id=<20170520171001.1D0C280B83@mail.hubot.pl>
May 20 19:10:01 hubot-vps postfix/qmgr[12183]: 1D0C280B83: from=<root@hubot.pl>, size=687, nrcpt=1 (queue active)
May 20 19:10:01 hubot-vps dovecot: lmtp(13873): Connect from local
May 20 19:10:01 hubot-vps dovecot: auth: Warning: sql: Ignoring changed user_query in /etc/dovecot/dovecot-sql.conf, because userdb sql not used. (If this is intentional, set userdb_warning_disable=yes)
May 20 19:10:01 hubot-vps dovecot: auth: Error: prefetch(hubot@hubot.pl): userdb lookup not possible with only userdb prefetch
May 20 19:10:01 hubot-vps postfix/lmtp[14110]: 1D0C280B83: to=<hubot@hubot.pl>, orig_to=<root>, relay=mail.hubot.pl[private/dovecot-lmtp], delay=0.09, delays=0.02/0.02/0.02/0.03, dsn=5.1.1, status=bounced (host mail.hubot.pl[private/dovecot-lmtp] said: 550 5.1.1 <hubot@hubot.pl> User doesn't exist: hubot@hubot.pl (in reply to RCPT TO command))
May 20 19:10:01 hubot-vps dovecot: lmtp(13873): Disconnect from local: Successful quit
May 20 19:10:01 hubot-vps postfix/cleanup[14106]: 30D9A80B84: message-id=<20170520171001.30D9A80B84@mail.hubot.pl>
May 20 19:10:01 hubot-vps postfix/qmgr[12183]: 30D9A80B84: from=<>, size=2671, nrcpt=1 (queue active)
May 20 19:10:01 hubot-vps dovecot: lmtp(13873): Connect from local
May 20 19:10:01 hubot-vps dovecot: auth: Error: prefetch(hubot@hubot.pl): userdb lookup not possible with only userdb prefetch
May 20 19:10:01 hubot-vps postfix/bounce[14113]: 1D0C280B83: sender non-delivery notification: 30D9A80B84
May 20 19:10:01 hubot-vps postfix/qmgr[12183]: 1D0C280B83: removed
May 20 19:10:01 hubot-vps postfix/lmtp[14110]: 30D9A80B84: to=<hubot@hubot.pl>, orig_to=<root@hubot.pl>, relay=mail.hubot.pl[private/dovecot-lmtp], delay=0.01, delays=0/0/0/0.01, dsn=5.1.1, status=bounced (host mail.hubot.pl[private/dovecot-lmtp] said: 550 5.1.1 <hubot@hubot.pl> User doesn't exist: hubot@hubot.pl (in reply to RCPT TO command))
May 20 19:10:01 hubot-vps dovecot: lmtp(13873): Disconnect from local: Successful quit
May 20 19:10:01 hubot-vps postfix/qmgr[12183]: 30D9A80B84: removed