I sent an email today, but failed to send it. Then I went to the server to check the log and found that the hard disk was filled with the cache queue and logs of spam,
Tail-F/var/log/maillog found the screen was flushed. Some logs are as follows:
Aug 17 09:39:01 www postfix/error[1173]: 455F050663: to=<[email protected]>, relay=none, delay=28778, delays=28631/146/0/0.51, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1229]: 296AE2FDCD: to=<[email protected]>, relay=none, delay=30507, delays=30360/147/0/0.21, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1138]: 1F9A853B47: to=<[email protected]>, relay=none, delay=28244, delays=28097/146/0/0.6, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1104]: B16DB3AB0B: to=<[email protected]>, relay=none, delay=29431, delays=29284/146/0/0.83, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1205]: B7F65597AE: to=<[email protected]>, relay=none, delay=26365, delays=26218/146/0/0.41, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1166]: 308EE43BD2: to=<[email protected]>, relay=none, delay=30716, delays=30569/147/0/0.06, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1140]: 9654E2B6A6: to=<[email protected]>, relay=none, delay=35359, delays=35213/146/0/0.79, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1134]: C74DA58B4C: to=<[email protected]>, relay=none, delay=26704, delays=26557/146/0/0.57, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)Aug 17 09:39:01 www postfix/error[1220]: 506172DC9A: to=<[email protected]>, relay=none, delay=34379, delays=34232/146/0/1.4, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mx-tw.mail.gm0.yahoodns.net[203.188.197.119] while sending RCPT TO)
Let's take a look at the process and load of the system. The system is dizzy and the load is 28, so the server is not moving.
[[email protected] /]# toptop - 09:42:06 up 2 days, 22:13, 1 user, load average: 28.81, 20.57, 12.43Tasks: 238 total, 1 running, 237 sleeping, 0 stopped, 0 zombieCpu(s): 4.4%us, 8.0%sy, 0.0%ni, 4.2%id, 82.7%wa, 0.5%hi, 0.2%si, 0.0%stMem: 3921316k total, 2927360k used, 993956k free, 520508k buffersSwap: 0k total, 0k used, 0k free, 671096k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 319 root 20 0 80764 3568 2656 S 3.7 0.1 0:13.37 master 323 postfix 20 0 80944 3568 2596 S 2.0 0.1 0:09.92 trivial-rewrite 322 postfix 20 0 103m 28m 2712 D 1.7 0.7 0:09.09 qmgr 862 root 20 0 249m 4784 1032 S 1.7 0.1 14:18.73 rsyslogd 448 postfix 20 0 80984 3592 2596 S 1.0 0.1 0:03.35 trivial-rewrite 255 root 20 0 0 0 0 D 0.7 0.0 5:59.75 jbd2/xvda1-8 400 postfix 20 0 94400 5164 3588 S 0.7 0.1 0:00.21 smtpd 1293 root 20 0 761m 8096 2072 S 0.7 0.2 4:48.66 aegis_cli 1877 postfix 20 0 80856 3528 2632 S 0.7 0.1 0:00.08 error 2024 postfix 20 0 80856 3536 2632 S 0.7 0.1 0:00.04 error 2152 postfix 20 0 80880 3492 2608 S 0.7 0.1 0:00.02 bounce 2158 postfix 20 0 80880 3496 2608 D 0.7 0.1 0:00.02 bounce 2162 root 20 0 15160 1428 1000 R 0.7 0.0 0:00.02 top 446 postfix 20 0 94400 5172 3604 S 0.3 0.1 0:00.18 smtpd 455 postfix 20 0 80988 3640 2712 S 0.3 0.1 0:00.10 cleanup 463 postfix 20 0 94400 5144 3576 S 0.3 0.1 0:00.16 smtpd 465 postfix 20 0 80988 3636 2712 S 0.3 0.1 0:00.10 cleanup 1018 postfix 20 0 80988 3640 2712 S 0.3 0.1 0:00.07 cleanup 1035 postfix 20 0 94400 5120 3548 S 0.3 0.1 0:00.09 smtpd 1040 postfix 20 0 94400 5140 3568 S 0.3 0.1 0:00.14 smtpd 1469 postfix 20 0 80856 3532 2632 S 0.3 0.1 0:00.22 error 1836 postfix 20 0 80856 3528 2632 S 0.3 0.1 0:00.09 error 1900 postfix 20 0 80856 3536 2632 S 0.3 0.1 0:00.06 error 1903 postfix 20 0 80856 3528 2632 S 0.3 0.1 0:00.06 error 1924 postfix 20 0 80856 3528 2632 S 0.3 0.1 0:00.06 error 1939 postfix 20 0 80856 3532 2632 S 0.3 0.1 0:00.05 error 1960 postfix 20 0 80856 3528 2632 S 0.3 0.1 0:00.05 error 1967 postfix 20 0 80856 3532 2632 S 0.3 0.1 0:00.05 error 1973 postfix 20 0 80856 3528 2632 S 0.3 0.1 0:00.05 error 1977 postfix 20 0 80856 3532 2632 S 0.3 0.1 0:00.04 error 2090 postfix 20 0 80880 3500 2608 D 0.3 0.1 0:00.01 bounce 2153 postfix 20 0 80880 3500 2608 D 0.3 0.1 0:00.01 bounce 2161 postfix 20 0 80880 3492 2608 D 0.3 0.1 0:00.01 bounce 2163 postfix 20 0 80880 3492 2608 D 0.3 0.1 0:00.01 bounce 2164 postfix 20 0 80880 3492 2608 D 0.3 0.1 0:00.01 bounce 2165 postfix 20 0 80880 3492 2608 D 0.3 0.1 0:00.01 bounce 2169 postfix 20 0 80880 3496 2608 D 0.3 0.1 0:00.01 bounce 2170 postfix 20 0 80880 3496 2608 D 0.3 0.1 0:00.01 bounce 2176 postfix 20 0 80880 3492 2608 D 0.3 0.1 0:00.01 bounce 1 root 20 0 19232 1088 820 S 0.0 0.0 0:00.87 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
Stop the Postfix service and check the content of the forwarded spam:
[[email protected] /]# postcat -q 847D9E8238*** ENVELOPE RECORDS deferred/8/847D9E8238 ***message_size: 6545 3068 26 0 6545message_arrival_time: Sun Aug 17 10:15:10 2014create_time: Sun Aug 17 10:15:10 2014named_attribute: rewrite_context=remotesender: [email protected]named_attribute: log_client_name=36-224-134-61.dynamic-ip.hinet.netnamed_attribute: log_client_address=36.224.134.61named_attribute: log_client_port=2806named_attribute: log_message_origin=36-224-134-61.dynamic-ip.hinet.net[36.224.134.61]named_attribute: log_helo_name=115.28.81.191named_attribute: log_protocol_name=SMTPnamed_attribute: client_name=36-224-134-61.dynamic-ip.hinet.netnamed_attribute: reverse_client_name=36-224-134-61.dynamic-ip.hinet.netnamed_attribute: client_address=36.224.134.61named_attribute: client_port=2806named_attribute: helo_name=115.28.81.191named_attribute: protocol_name=SMTPnamed_attribute: client_address_type=2named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]named_attribute: dsn_orig_rcpt=rfc822;[email protected]original_recipient: [email protected]recipient: [email protected]*** MESSAGE CONTENTS deferred/8/847D9E8238 ***Received: from 115.28.81.191 (36-224-134-61.dynamic-ip.hinet.net [36.224.134.61]) by mail.sintie.com (Postfix) with SMTP id 847D9E8238; Sun, 17 Aug 2014 10:15:10 +0800 (CST)Received: from 65.64.252.253 by ; Sun, 17 Aug 2014 06:09:08 +0400
Postfix is very powerful. You can set security authentication-related items to improve the security level.
After reconfiguration and authentication, check the log again:
Aug 17 10:52:49 www postfix/smtpd[5864]: NOQUEUE: reject: RCPT from 114-45-30-4.dynamic.hinet.net[114.45.30.4]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:49 www postfix/smtpd[5863]: NOQUEUE: reject: RCPT from 118-161-251-198.dynamic.hinet.net[118.161.251.198]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5865]: connect from 118-161-241-28.dynamic.hinet.net[118.161.241.28]Aug 17 10:52:50 www postfix/smtpd[5863]: NOQUEUE: reject: RCPT from 118-161-251-198.dynamic.hinet.net[118.161.251.198]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5864]: NOQUEUE: reject: RCPT from 114-45-30-4.dynamic.hinet.net[114.45.30.4]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5864]: NOQUEUE: reject: RCPT from 114-45-30-4.dynamic.hinet.net[114.45.30.4]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:50 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5859]: NOQUEUE: reject: RCPT from 114-45-30-4.dynamic.hinet.net[114.45.30.4]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5863]: NOQUEUE: reject: RCPT from 118-161-251-198.dynamic.hinet.net[118.161.251.198]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5864]: NOQUEUE: reject: RCPT from 114-45-30-4.dynamic.hinet.net[114.45.30.4]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>Aug 17 10:52:51 www postfix/smtpd[5865]: NOQUEUE: reject: RCPT from 118-161-241-28.dynamic.hinet.net[118.161.241.28]: 504 5.5.2 <115.28.81.191>: Helo command rejected: need fully-qualified hostname; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<115.28.81.191>
It was rejected by the server.
If you can analyze the log dynamically, put the IP address in the firewall and pass it directly.