Oct  6 08:26:37 localhost sshd\[51000\]: Invalid user Living@2017 from 1.179.137.10 port 57177
Oct  6 08:26:37 localhost sshd\[51000\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.179.137.10
Oct  6 08:26:40 localhost sshd\[51000\]: Failed password for invalid user Living@2017 from 1.179.137.10 port 57177 ssh2
Oct  6 08:31:10 localhost sshd\[51094\]: Invalid user Miami@2018 from 1.179.137.10 port 50981
Oct  6 08:31:10 localhost sshd\[51094\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.179.137.10
...

Oct  5 22:01:09 sachi sshd\[4855\]: Invalid user Ronald@123 from 174.138.26.48
Oct  5 22:01:09 sachi sshd\[4855\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=174.138.26.48
Oct  5 22:01:11 sachi sshd\[4855\]: Failed password for invalid user Ronald@123 from 174.138.26.48 port 46030 ssh2
Oct  5 22:06:55 sachi sshd\[23750\]: Invalid user P@\$\$w0rt0101 from 174.138.26.48
Oct  5 22:06:55 sachi sshd\[23750\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=174.138.26.48

Oct  6 08:36:10 web8 sshd\[9384\]: Invalid user P@SSWORD@2016 from 167.71.228.9
Oct  6 08:36:10 web8 sshd\[9384\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.71.228.9
Oct  6 08:36:11 web8 sshd\[9384\]: Failed password for invalid user P@SSWORD@2016 from 167.71.228.9 port 54280 ssh2
Oct  6 08:40:50 web8 sshd\[11826\]: Invalid user P@SSWORD@2016 from 167.71.228.9
Oct  6 08:40:50 web8 sshd\[11826\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.71.228.9

Oct  6 07:58:30 mail postfix/smtpd\[27917\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 08:53:39 mail postfix/smtpd\[31306\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 09:21:01 mail postfix/smtpd\[31816\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 09:48:52 mail postfix/smtpd\[32367\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

2019-10-06T08:09:28.647812abusebot.cloudsearch.cf sshd\[22013\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.114  user=root

Email spam. Multiple attempts to send e-mail from invalid/unknown sender domain.
Date: 2019 Oct 06. 05:34:55
Source IP: 103.221.254.73

Portion of the log(s):
Oct 6 05:34:55 vserv postfix/smtpd[22964]: NOQUEUE: reject: RCPT from unknown[103.221.254.73]: 450 4.1.8 : Sender address rejected: Domain not found; from= to=<28@[removed].at> proto=ESMTP helo=<10.com>
Oct 6 05:34:54 vserv postfix/smtpd[22964]: NOQUEUE: reject: RCPT from unknown[103.221.254.73]: 450 4.1.8 : Sender address rejected: Domain not found; from= to=<27@[removed].at> proto=ESMTP helo=<10.com>
Oct 6 05:34:53 vserv postfix/smtpd[22964]: NOQUEUE: reject: RCPT from unknown[103.221.254.73]: 450 4.1.8 : Sender address rejected: Domain not found; from= to=<26@[removed].at> proto=ESMTP helo=<10.com>
Oct 6 05:34:52 vserv postfix/smtpd[22964]: NOQUEUE: reject: RCPT from ....

Oct  6 08:24:47 vpn01 sshd[7877]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=87.120.36.157
Oct  6 08:24:49 vpn01 sshd[7877]: Failed password for invalid user administrator from 87.120.36.157 port 54754 ssh2
...

2019-10-06T02:23:47.5853551495-001 sshd\[34928\]: Failed password for invalid user Caffee2017 from 201.235.19.122 port 44653 ssh2
2019-10-06T02:42:57.2467451495-001 sshd\[36161\]: Invalid user PASSW0RD!@ from 201.235.19.122 port 39818
2019-10-06T02:42:57.2498571495-001 sshd\[36161\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=122-19-235-201.fibertel.com.ar
2019-10-06T02:42:59.5855471495-001 sshd\[36161\]: Failed password for invalid user PASSW0RD!@ from 201.235.19.122 port 39818 ssh2
2019-10-06T02:47:36.7116651495-001 sshd\[36475\]: Invalid user PASSW0RD!@ from 201.235.19.122 port 59773
2019-10-06T02:47:36.7191331495-001 sshd\[36475\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=122-19-235-201.fibertel.com.ar
...

Oct  6 07:52:21 icinga sshd[17432]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=59.173.19.66
Oct  6 07:52:24 icinga sshd[17432]: Failed password for invalid user PHP@123 from 59.173.19.66 port 55998 ssh2
...

2019-10-06T08:31:55.380486abusebot-5.cloudsearch.cf sshd\[9305\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.173.154  user=root

2019-10-06T03:49:08.747828abusebot-8.cloudsearch.cf sshd\[6241\]: Invalid user admin from 113.161.179.184 port 34869

Automatic report - Port Scan Attack

Oct  6 04:08:55 plusreed sshd[25957]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.113  user=root
Oct  6 04:08:56 plusreed sshd[25957]: Failed password for root from 49.88.112.113 port 62377 ssh2
...

Oct  6 11:22:23 sauna sshd[193067]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=64.202.187.48
Oct  6 11:22:24 sauna sshd[193067]: Failed password for invalid user 123E456Y from 64.202.187.48 port 36368 ssh2
...

Oct  6 09:54:50 piServer sshd[31962]: Failed password for root from 194.37.92.42 port 56634 ssh2
Oct  6 09:59:13 piServer sshd[32240]: Failed password for root from 194.37.92.42 port 48677 ssh2
...