Dec 19 15:38:35 grey postfix/smtpd\[5369\]: NOQUEUE: reject: RCPT from 89-172-68-134.adsl.net.t-com.hr\[89.172.68.134\]: 554 5.7.1 Service unavailable\; Client host \[89.172.68.134\] blocked using dul.dnsbl.sorbs.net\; Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml\?89.172.68.134\; from=\ to=\ proto=ESMTP helo=\<89-172-68-134.adsl.net.t-com.hr\>
...

2019-12-19 15:24:52 auth_login authenticator failed for (localhost.localdomain) [188.162.43.22]: 535 Incorrect authentication data (set_id=news@bobostore.ru)
2019-12-19 15:41:15 auth_login authenticator failed for (localhost.localdomain) [188.162.43.22]: 535 Incorrect authentication data (set_id=news@rada.poltava.ua)
...

Dec 19 16:38:23 nextcloud sshd\[31627\]: Invalid user hamada from 51.77.215.227
Dec 19 16:38:23 nextcloud sshd\[31627\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.77.215.227
Dec 19 16:38:25 nextcloud sshd\[31627\]: Failed password for invalid user hamada from 51.77.215.227 port 53756 ssh2
...

12/19/2019-17:02:10.989239 80.82.65.74 Protocol: 6 ET DROP Dshield Block Listed Source group 1

Dec 19 09:38:00 TORMINT sshd\[439\]: Invalid user hung from 37.203.174.76
Dec 19 09:38:00 TORMINT sshd\[439\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.203.174.76
Dec 19 09:38:01 TORMINT sshd\[439\]: Failed password for invalid user hung from 37.203.174.76 port 33390 ssh2
...

Lines containing failures of 217.112.142.185
Dec 19 15:23:15 shared01 postfix/smtpd[23598]: connect from servant.yobaat.com[217.112.142.185]
Dec 19 15:23:15 shared01 policyd-spf[32452]: prepend Received-SPF: Pass (mailfrom) identhostnamey=mailfrom; client-ip=217.112.142.185; helo=servant.moveincool.com; envelope-from=x@x
Dec x@x
Dec 19 15:23:15 shared01 postfix/smtpd[23598]: disconnect from servant.yobaat.com[217.112.142.185] ehlo=1 mail=1 rcpt=0/1 data=0/1 quhostname=1 commands=3/5
Dec 19 15:26:54 shared01 postfix/smtpd[27638]: connect from servant.yobaat.com[217.112.142.185]
Dec 19 15:26:55 shared01 policyd-spf[985]: prepend Received-SPF: Pass (mailfrom) identhostnamey=mailfrom; client-ip=217.112.142.185; helo=servant.moveincool.com; envelope-from=x@x
Dec x@x
Dec 19 15:26:55 shared01 postfix/smtpd[27638]: disconnect from servant.yobaat.com[217.112.142.185] ehlo=1 mail=1 rcpt=0/1 data=0/1 quhostname=1 commands=3/5
Dec 19 15:27:40 shared01 postfix/smtpd[27638]: connect f........
------------------------------

Dec 16 23:06:51 lvps92-51-164-246 sshd[31016]: reveeclipse mapping checking getaddrinfo for 163-172-39-84.rev.poneytelecom.eu [163.172.39.84] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec 16 23:06:51 lvps92-51-164-246 sshd[31016]: Invalid user holicki from 163.172.39.84
Dec 16 23:06:51 lvps92-51-164-246 sshd[31016]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=163.172.39.84 
Dec 16 23:06:53 lvps92-51-164-246 sshd[31016]: Failed password for invalid user holicki from 163.172.39.84 port 53535 ssh2
Dec 16 23:06:53 lvps92-51-164-246 sshd[31016]: Received disconnect from 163.172.39.84: 11: Bye Bye [preauth]
Dec 16 23:13:48 lvps92-51-164-246 sshd[31050]: reveeclipse mapping checking getaddrinfo for 163-172-39-84.rev.poneytelecom.eu [163.172.39.84] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec 16 23:13:48 lvps92-51-164-246 sshd[31050]: Invalid user nagys from 163.172.39.84
Dec 16 23:13:48 lvps92-51-164-246 sshd[31050]: pam_unix(sshd:auth): authen........
-------------------------------

Dec 19 15:38:19 web8 sshd\[18759\]: Invalid user tollestrup from 85.95.191.56
Dec 19 15:38:19 web8 sshd\[18759\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=85.95.191.56
Dec 19 15:38:21 web8 sshd\[18759\]: Failed password for invalid user tollestrup from 85.95.191.56 port 45978 ssh2
Dec 19 15:45:54 web8 sshd\[22447\]: Invalid user woehl from 85.95.191.56
Dec 19 15:45:54 web8 sshd\[22447\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=85.95.191.56

Dec 19 09:38:34 web1 postfix/smtpd[30987]: warning: unknown[123.169.101.172]: SASL LOGIN authentication failed: authentication failure
...

Dec 19 15:38:23 debian-2gb-nbg1-2 kernel: \[419071.280291\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=82.186.120.234 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=51 ID=20719 PROTO=TCP SPT=31747 DPT=23 WINDOW=27665 RES=0x00 SYN URGP=0

Dec 19 05:25:39 php1 sshd\[11248\]: Invalid user wheless from 150.109.150.223
Dec 19 05:25:39 php1 sshd\[11248\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=150.109.150.223
Dec 19 05:25:42 php1 sshd\[11248\]: Failed password for invalid user wheless from 150.109.150.223 port 58328 ssh2
Dec 19 05:31:35 php1 sshd\[11808\]: Invalid user al from 150.109.150.223
Dec 19 05:31:35 php1 sshd\[11808\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=150.109.150.223

Dec 19 23:43:49 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:52 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:56 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:56 bacztwo sshd[16708]: Failed keyboard-interactive/pam for root from 112.85.42.181 port 53564 ssh2
Dec 19 23:43:46 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:49 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:52 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:56 bacztwo sshd[16708]: error: PAM: Authentication failure for root from 112.85.42.181
Dec 19 23:43:56 bacztwo sshd[16708]: Failed keyboard-interactive/pam for root from 112.85.42.181 port 53564 ssh2
Dec 19 23:43:59 bacztwo sshd[16708]: error: PAM: Authentication failure fo
...

1576766315 - 12/19/2019 15:38:35 Host: 118.71.198.203/118.71.198.203 Port: 445 TCP Blocked

Unauthorized connection attempt detected from IP address 164.52.0.142 to port 445

Trying out my SMTP servers:
Out: 220 ,In:  EHLO ylmf-pc, Out: 503 5.5.1 Error: authentication not enabled, Out: 421 4.4.2 Error: timeout exceeded