spam – Postfix – Relay access denied, disconnect from unknown IP, RCPT from unknown IP spameri@tiscali.it

I have Postfix installed in my cloud server. I got tons of warning in my mail log:

Nov 26 18:37:56 ubuntu-4gb-fsn1-1 postfix/smtpd(66066): warning: hostname ip-113-120.4vendeta.com does not resolve to address 78.128.113.120: Name or service not known
Nov 26 18:37:56 ubuntu-4gb-fsn1-1 postfix/smtpd(66066): connect from unknown(78.128.113.120)
Nov 26 18:37:57 ubuntu-4gb-fsn1-1 postfix/smtpd(66066): lost connection after EHLO from unknown(78.128.113.120)
Nov 26 18:37:57 ubuntu-4gb-fsn1-1 postfix/smtpd(66066): disconnect from unknown(78.128.113.120) ehlo=1 commands=1
Nov 26 18:41:17 ubuntu-4gb-fsn1-1 postfix/anvil(66068): statistics: max connection rate 1/60s for (smtp:78.128.113.120) at Nov 26 18:37:56
Nov 26 18:41:17 ubuntu-4gb-fsn1-1 postfix/anvil(66068): statistics: max connection count 1 for (smtp:78.128.113.120) at Nov 26 18:37:56
Nov 26 18:41:17 ubuntu-4gb-fsn1-1 postfix/anvil(66068): statistics: max cache size 1 at Nov 26 18:37:56
Nov 26 19:28:48 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): connect from unknown(165.231.143.37)
Nov 26 19:28:50 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): NOQUEUE: reject: RCPT from unknown(165.231.143.37): 454 4.7.1 <spameri@tiscali.it>: Relay access denied; from=<spameri@tiscali.it> to=<spameri@tiscali.it> proto=ESMTP helo=<WIN-QGFOVKPDT6T>
Nov 26 19:28:51 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): disconnect from unknown(165.231.143.37) ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1 commands=4/5
Nov 26 19:30:00 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): connect from unknown(165.231.143.37)
Nov 26 19:30:02 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): NOQUEUE: reject: RCPT from unknown(165.231.143.37): 454 4.7.1 <spameri@tiscali.it>: Relay access denied; from=<spameri@tiscali.it> to=<spameri@tiscali.it> proto=ESMTP helo=<WIN-QGFOVKPDT6T>
Nov 26 19:30:05 ubuntu-4gb-fsn1-1 postfix/smtpd(66634): disconnect from unknown(165.231.143.37) ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1 commands=4/5
Nov 26 19:32:24 ubuntu-4gb-fsn1-1 postfix/smtpd(66651): connect from unknown(165.231.143.37)
Nov 26 19:32:27 ubuntu-4gb-fsn1-1 postfix/smtpd(66651): NOQUEUE: reject: RCPT from unknown(165.231.143.37): 454 4.7.1 <spameri@tiscali.it>: Relay access denied; from=<spameri@tiscali.it> to=<spameri@tiscali.it> proto=ESMTP helo=<WIN-QGFOVKPDT6T>
Nov 26 19:32:27 ubuntu-4gb-fsn1-1 postfix/smtpd(66651): disconnect from unknown(165.231.143.37) ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1 commands=4/5
Nov 26 19:35:47 ubuntu-4gb-fsn1-1 postfix/anvil(66636): statistics: max connection rate 1/60s for (smtp:165.231.143.37) at Nov 26 19:28:48
Nov 26 19:35:47 ubuntu-4gb-fsn1-1 postfix/anvil(66636): statistics: max connection count 1 for (smtp:165.231.143.37) at Nov 26 19:28:48
Nov 26 19:35:47 ubuntu-4gb-fsn1-1 postfix/anvil(66636): statistics: max cache size 1 at Nov 26 19:28:48
Nov 26 19:37:55 ubuntu-4gb-fsn1-1 postfix/smtpd(66673): connect from unknown(165.231.143.37)
Nov 26 19:40:32 ubuntu-4gb-fsn1-1 postfix/smtpd(66673): NOQUEUE: reject: RCPT from unknown(165.231.143.37): 454 4.7.1 <spameri@tiscali.it>: Relay access denied; from=<spameri@tiscali.it> to=<spameri@tiscali.it> proto=ESMTP helo=<WIN-QGFOVKPDT6T>
Nov 26 19:42:32 ubuntu-4gb-fsn1-1 postfix/smtpd(66673): disconnect from unknown(165.231.143.37) ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1 commands=4/5
Nov 26 19:45:52 ubuntu-4gb-fsn1-1 postfix/anvil(66675): statistics: max connection rate 1/60s for (smtp:165.231.143.37) at Nov 26 19:37:55
Nov 26 19:45:52 ubuntu-4gb-fsn1-1 postfix/anvil(66675): statistics: max connection count 1 for (smtp:165.231.143.37) at Nov 26 19:37:55
Nov 26 19:45:52 ubuntu-4gb-fsn1-1 postfix/anvil(66675): statistics: max cache size 1 at Nov 26 19:37:55
Nov 26 19:49:51 ubuntu-4gb-fsn1-1 postfix/smtpd(66811): warning: hostname ip-113-121.4vendeta.com does not resolve to address 78.128.113.121: Name or service not known
Nov 26 19:49:51 ubuntu-4gb-fsn1-1 postfix/smtpd(66811): connect from unknown(78.128.113.121)
Nov 26 19:49:51 ubuntu-4gb-fsn1-1 postfix/smtpd(66811): lost connection after EHLO from unknown(78.128.113.121)
Nov 26 19:49:51 ubuntu-4gb-fsn1-1 postfix/smtpd(66811): disconnect from unknown(78.128.113.121) ehlo=1 commands=1
Nov 26 19:53:11 ubuntu-4gb-fsn1-1 postfix/anvil(66813): statistics: max connection rate 1/60s for (smtp:78.128.113.121) at Nov 26 19:49:51
Nov 26 19:53:11 ubuntu-4gb-fsn1-1 postfix/anvil(66813): statistics: max connection count 1 for (smtp:78.128.113.121) at Nov 26 19:49:51
Nov 26 19:53:11 ubuntu-4gb-fsn1-1 postfix/anvil(66813): statistics: max cache size 1 at Nov 26 19:49:51

Should I do anything about this? They look like spams. How do they get into my server’s mail log?

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Chào các bác, chẳng hạn như tiêu đề nếu site của mình đang ở quá trình còn thơ bé, biết cách đi mà bị một thủ thuật nào đó chơi xấu bằng cách spam từ khóa của trang web mình vô tội, ở mọi diễn đàn, trang web xấu , không lành mạnh nhằm mục đích google coi từ khóa của mình là thư rác, thì chúng ta sẽ phải phục hồi, ngăn chặn trạng thái đó như thế nào vậy mọi người.


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