I set up brand new Postfix server last night and did not configure at all yet, just did the install. So, I logged in this morning to finish the configuration and notice that there is stuff in the log:
Jan 8 22:31:32 hwsrv-218892 postfix/postfix-script[17415]: starting the Postfix mail system
Jan 8 22:31:32 hwsrv-218892 postfix/master[17417]: daemon started -- version 3.1.6, configuration /etc/postfix
Jan 9 05:15:15 hwsrv-218892 postfix/smtpd[20781]: connect from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]
Jan 9 05:15:15 hwsrv-218892 postfix/smtpd[20781]: NOQUEUE: reject: RCPT from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]: 454 4.7.1 <gogo@linwayedm.com.tw>: Relay access denied; from=<dlh@email.cta.cq.cnt> to=<gogo@linwayedm.com.tw> proto=SMTP helo=<23.254.144.153>
Jan 9 05:15:16 hwsrv-218892 postfix/smtpd[20781]: lost connection after RCPT from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]
Jan 9 05:15:16 hwsrv-218892 postfix/smtpd[20781]: disconnect from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108] helo=1 mail=1 rcpt=0/1 commands=2/3
Jan 9 05:15:40 hwsrv-218892 postfix/smtpd[20781]: connect from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]
Jan 9 05:15:41 hwsrv-218892 postfix/smtpd[20781]: NOQUEUE: reject: RCPT from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]: 454 4.7.1 <gogo@linwayedm.com.tw>: Relay access denied; from=<dlh@email.cta.cq.cnt> to=<gogo@linwayedm.com.tw> proto=SMTP helo=<23.254.161.138>
Jan 9 05:15:41 hwsrv-218892 postfix/smtpd[20781]: lost connection after RCPT from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108]
Jan 9 05:15:41 hwsrv-218892 postfix/smtpd[20781]: disconnect from 118-161-157-108.dynamic-ip.hinet.net[118.161.157.108] helo=1 mail=1 rcpt=0/1 commands=2/3
Jan 9 05:19:01 hwsrv-218892 postfix/anvil[20784]: statistics: max connection rate 2/60s for (smtp:118.161.157.108) at Jan 9 05:15:40
Jan 9 05:19:01 hwsrv-218892 postfix/anvil[20784]: statistics: max connection count 1 for (smtp:118.161.157.108) at Jan 9 05:15:15
Jan 9 05:19:01 hwsrv-218892 postfix/anvil[20784]: statistics: max cache size 1 at Jan 9 05:15:15
What are the NOQUEUE messages? Does that mean somebody was trying to use my server to relay spam? If so, how can I make sure that does not happen?