Just checking if I have things set up correctly. I'm returning a 554 code (rejected relay) yet the attempts keep coming.
Postfix avil is throttling the user, so I assume this isn't a problem. As an FYI, checking MXTOOL blacklist on the offending IP, only blocklist.de has them flagged at the moment. A snippet of postfix log with my domain altered to stay off google: ------------------ Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: connect from hwsrv-230330.hostwindsdns.com[104.168.137.238] Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: NOQUEUE: reject: RCPT from hwsrv-230330.hostwindsdns.com[104.168.137.238]: 554 5.7.1 <1029mandadi...@gmail.com>: Relay access denied; from=<com...@example.com> to=<1029mandadi...@gmail.com> proto=ESMTP helo=<hwsrv-230330.hostwindsdns.com> Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: lost connection after RCPT from hwsrv-230330.hostwindsdns.com[104.168.137.238] Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: disconnect from hwsrv-230330.hostwindsdns.com[104.168.137.238] ehlo=1 mail=1 rcpt=0/1 commands=2/3 Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26188]: connect from hwsrv-230330.hostwindsdns.com[104.168.137.238] Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26188]: NOQUEUE: reject: RCPT from hwsrv-230330.hostwindsdns.com[104.168.137.238]: 554 5.7.1 <1029mandadi...@gmail.com>: Relay access denied; from=<bi...@example.com> to=<1029mandadi...@gmail.com> proto=ESMTP helo=<hwsrv-230330.hostwindsdns.com> Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26188]: lost connection after RCPT from hwsrv-230330.hostwindsdns.com[104.168.137.238] Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26188]: disconnect from hwsrv-230330.hostwindsdns.com[104.168.137.238] ehlo=1 mail=1 rcpt=0/1 commands=2/3 Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: connect from hwsrv-230330.hostwindsdns.com[104.168.137.238] Mar 17 23:00:32 centos-1gb-sfo1-01 postfix/smtpd[26199]: warning: Connection rate limit exceeded: 4 from hwsrv-230330.hostwindsdns.com[104.168.137.238] for service smtp
