Oct 13 00:10:08 our-server-hostname postfix/smtpd[27373]: connect from unknown[160.20.109.4]
Oct x@x
Oct 13 00:11:09 our-server-hostname postfix/smtpd[27373]: disconnect from unknown[160.20.109.4]
Oct 13 00:14:02 our-server-hostname postfix/smtpd[26665]: connect from unknown[160.20.109.4]
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct 13 00:14:09 our-server-hostname postfix/smtpd[26665]: too many errors after DATA from unknown[160.20.109.4]
Oct 13 00:14:09 our-server-hostname postfix/smtpd[26665]: disconnect from unknown[160.20.109.4]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=160.20.109.4

Invalid user 123 from 45.55.38.39 port 48661

Automatic report - Banned IP Access

Unauthorised access (Oct 12) SRC=42.85.26.195 LEN=40 TTL=49 ID=32431 TCP DPT=8080 WINDOW=19911 SYN 
Unauthorised access (Oct 10) SRC=42.85.26.195 LEN=40 TTL=49 ID=39765 TCP DPT=8080 WINDOW=50783 SYN 
Unauthorised access (Oct 10) SRC=42.85.26.195 LEN=40 TTL=49 ID=9208 TCP DPT=8080 WINDOW=50783 SYN

Oct 12 10:26:44 hanapaa sshd\[12713\]: Invalid user Test@1234 from 211.159.175.1
Oct 12 10:26:44 hanapaa sshd\[12713\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.159.175.1
Oct 12 10:26:47 hanapaa sshd\[12713\]: Failed password for invalid user Test@1234 from 211.159.175.1 port 49752 ssh2
Oct 12 10:31:15 hanapaa sshd\[13120\]: Invalid user Contrasena@12345 from 211.159.175.1
Oct 12 10:31:15 hanapaa sshd\[13120\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.159.175.1

Dovecot Brute-Force

\[2019-10-12 15:56:10\] SECURITY\[1898\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-10-12T15:56:10.222-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="3075101148413828012",SessionID="0x7fc3ad578188",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.247.110.232/19251",ACLName="no_extension_match"
\[2019-10-12 15:56:39\] SECURITY\[1898\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-10-12T15:56:39.913-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="2656701148632170013",SessionID="0x7fc3ac2ed548",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.247.110.232/57048",ACLName="no_extension_match"
\[2019-10-12 15:56:42\] SECURITY\[1898\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-10-12T15:56:42.684-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="3492601148323235001",SessionID="0x7fc3ad578188",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.247.110.232/4915",A

Unsolicited bulk porn & phishing - varying ISPs (primarily Chinanet); repetitive redirects from blacklisted IP 92.63.192.124 & .151; spam volume up to 15/day.  

Unsolicited bulk spam - u-gun.co.jp, CHINANET NeiMengGu province network - 1.183.152.253

Sender domain hekimpor.com = 212.252.63.11 Tellcom Customer LAN

Repetitive reply-to in this spam series.
Reply-To: nanikarige@yahoo.com

Spam series change: no phishing redirect spam link.  Malicious attachment - Outlook blocked access to unsafe attachment: 22.jpg

[portscan] Port scan

Oct 12 05:27:08 hanapaa sshd\[17912\]: Invalid user Versailles_123 from 222.124.16.227
Oct 12 05:27:08 hanapaa sshd\[17912\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.124.16.227
Oct 12 05:27:10 hanapaa sshd\[17912\]: Failed password for invalid user Versailles_123 from 222.124.16.227 port 37800 ssh2
Oct 12 05:32:51 hanapaa sshd\[18424\]: Invalid user Triple123 from 222.124.16.227
Oct 12 05:32:51 hanapaa sshd\[18424\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.124.16.227

Oct 12 10:39:29 php1 sshd\[27173\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.254.247.239  user=root
Oct 12 10:39:31 php1 sshd\[27173\]: Failed password for root from 104.254.247.239 port 42794 ssh2
Oct 12 10:43:37 php1 sshd\[27547\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.254.247.239  user=root
Oct 12 10:43:39 php1 sshd\[27547\]: Failed password for root from 104.254.247.239 port 54750 ssh2
Oct 12 10:47:47 php1 sshd\[27858\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.254.247.239  user=root

Oct 12 21:14:06 vps647732 sshd[5588]: Failed password for root from 118.140.117.59 port 46846 ssh2
...

Oct 12 16:33:22 firewall sshd[30516]: Invalid user Darkness2017 from 51.254.123.127
Oct 12 16:33:23 firewall sshd[30516]: Failed password for invalid user Darkness2017 from 51.254.123.127 port 39307 ssh2
Oct 12 16:37:33 firewall sshd[30622]: Invalid user Qwerty@12 from 51.254.123.127
...

Oct 12 **REMOVED** dovecot: imap-login: Disconnected \(auth failed, 1 attempts in 5 secs\): user=\, method=PLAIN, rip=200.94.22.27, lip=**REMOVED**, TLS: Disconnected, session=\
Oct 12 **REMOVED** dovecot: imap-login: Disconnected \(auth failed, 1 attempts in 5 secs\): user=\, method=PLAIN, rip=200.94.22.27, lip=**REMOVED**, TLS, session=\
Oct 12 **REMOVED** dovecot: imap-login: Disconnected \(auth failed, 1 attempts in 4 secs\): user=\<**REMOVED**.deekaterina_ushakova@**REMOVED**.de\>, method=PLAIN, rip=200.94.22.27, lip=**REMOVED**, TLS, session=\

$f2bV_matches