Apr  9 09:27:28 vpn01 sshd[10821]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.241.249.53
Apr  9 09:27:30 vpn01 sshd[10821]: Failed password for invalid user csgoserver from 192.241.249.53 port 37778 ssh2
...

Apr  9 11:41:39 hosting sshd[14488]: Invalid user bud from 201.216.239.241 port 51030
Apr  9 11:41:40 hosting sshd[14488]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.216.239.241
Apr  9 11:41:39 hosting sshd[14488]: Invalid user bud from 201.216.239.241 port 51030
Apr  9 11:41:42 hosting sshd[14488]: Failed password for invalid user bud from 201.216.239.241 port 51030 ssh2
...

(sshd) Failed SSH login from 139.59.43.6 (IN/India/-): 10 in the last 3600 secs

2020-04-09T06:59:25.182905abusebot-2.cloudsearch.cf sshd[31223]: Invalid user deploy from 190.196.64.93 port 43548
2020-04-09T06:59:25.189211abusebot-2.cloudsearch.cf sshd[31223]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.196.64.93
2020-04-09T06:59:25.182905abusebot-2.cloudsearch.cf sshd[31223]: Invalid user deploy from 190.196.64.93 port 43548
2020-04-09T06:59:26.853418abusebot-2.cloudsearch.cf sshd[31223]: Failed password for invalid user deploy from 190.196.64.93 port 43548 ssh2
2020-04-09T07:04:59.778783abusebot-2.cloudsearch.cf sshd[31563]: Invalid user ubuntu from 190.196.64.93 port 52348
2020-04-09T07:04:59.785485abusebot-2.cloudsearch.cf sshd[31563]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.196.64.93
2020-04-09T07:04:59.778783abusebot-2.cloudsearch.cf sshd[31563]: Invalid user ubuntu from 190.196.64.93 port 52348
2020-04-09T07:05:01.635433abusebot-2.cloudsearch.cf sshd[31563]: F
...

Dovecot Invalid User Login Attempt.

Apr  9 10:01:26 roki sshd[6236]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.211.30.70  user=root
Apr  9 10:01:27 roki sshd[6236]: Failed password for root from 129.211.30.70 port 44462 ssh2
Apr  9 10:07:55 roki sshd[6666]: Invalid user ssh from 129.211.30.70
Apr  9 10:07:55 roki sshd[6666]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.211.30.70
Apr  9 10:07:57 roki sshd[6666]: Failed password for invalid user ssh from 129.211.30.70 port 53992 ssh2
...

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Apr  9 06:51:08 elektron postfix/smtpd\[961\]: NOQUEUE: reject: RCPT from unknown\[124.113.218.240\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[124.113.218.240\]\; from=\ to=\ proto=ESMTP helo=\
Apr  9 06:51:37 elektron postfix/smtpd\[961\]: NOQUEUE: reject: RCPT from unknown\[124.113.218.240\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[124.113.218.240\]\; from=\ to=\ proto=ESMTP helo=\
Apr  9 06:52:21 elektron postfix/smtpd\[961\]: NOQUEUE: reject: RCPT from unknown\[124.113.218.240\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[124.113.218.240\]\; from=\ to=\ proto=ESMTP helo=\
Apr  9 06:54:03 elektron postfix/smtpd\[1425\]: NOQUEUE: reject: RCPT from unknown\[124.113.218.240\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[124.113.218.240\]\; from=\

Apr  9 09:29:49 ns382633 sshd\[27250\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.160.111.78  user=root
Apr  9 09:29:52 ns382633 sshd\[27250\]: Failed password for root from 220.160.111.78 port 2782 ssh2
Apr  9 09:33:39 ns382633 sshd\[28016\]: Invalid user deploy from 220.160.111.78 port 2783
Apr  9 09:33:39 ns382633 sshd\[28016\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.160.111.78
Apr  9 09:33:41 ns382633 sshd\[28016\]: Failed password for invalid user deploy from 220.160.111.78 port 2783 ssh2

$f2bV_matches

Excessive Port-Scanning

20/4/9@04:03:04: FAIL: Alarm-SSH address from=51.15.110.205
...

Apr  9 11:11:03 relay postfix/smtpd\[4346\]: warning: unknown\[92.118.38.66\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  9 11:11:15 relay postfix/smtpd\[30468\]: warning: unknown\[92.118.38.66\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  9 11:11:51 relay postfix/smtpd\[4346\]: warning: unknown\[92.118.38.66\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  9 11:12:04 relay postfix/smtpd\[27245\]: warning: unknown\[92.118.38.66\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  9 11:12:41 relay postfix/smtpd\[27738\]: warning: unknown\[92.118.38.66\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Apr  9 11:32:40 itv-usvr-01 sshd[23496]: Invalid user user from 59.90.47.72
Apr  9 11:32:40 itv-usvr-01 sshd[23496]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=59.90.47.72
Apr  9 11:32:40 itv-usvr-01 sshd[23496]: Invalid user user from 59.90.47.72
Apr  9 11:32:42 itv-usvr-01 sshd[23496]: Failed password for invalid user user from 59.90.47.72 port 56081 ssh2
Apr  9 11:39:12 itv-usvr-01 sshd[23869]: Invalid user test from 59.90.47.72

Apr  9 10:41:22 server sshd[11141]: Failed password for invalid user test from 195.96.77.125 port 35172 ssh2
Apr  9 10:47:14 server sshd[12317]: Failed password for invalid user gradle from 195.96.77.125 port 53764 ssh2
Apr  9 10:50:51 server sshd[12992]: Failed password for invalid user ubuntu from 195.96.77.125 port 39002 ssh2