Hello HTF Friends, Setup : Multi-server OS : Ubuntu 16.0.4 Server type : Nginx Databse : mySql Services : postfix, dovecot I've searching all over and battling with this problem all day and can't seem to figure out what went wrong. Mails stopped working on one of my servers. I get the below posted error every time i try to send a mail from any site hosted on the server. Code: Feb 23 22:18:59 webserver1 postfix/smtp[16533]: 05DC01F8D8: host mail1.coolwebsite.com[mail1.ServerIP] said: 450 4.7.1 <webserver1.webservice.com>: Helo command rejected: Host not found (in reply to RCPT TO command) Feb 23 22:18:59 webserver1 postfix/smtp[16581]: 0A2551F822: host mail1.coolwebsite.com[mail1.ServerIP] said: 450 4.7.1 <webserver1.webservice.com>: Helo command rejected: Host not found (in reply to RCPT TO command) Code: Feb 23 22:01:48 ams1 dovecot: lmtp(15521): Connect from local Feb 23 22:01:48 ams1 dovecot: lmtp([email protected]): JK8vBEx7N42ChPPGKJARwfzIP: sieve: msgid=<[email protected]>: stored mail into mailbox 'INBOX' Feb 23 22:01:48 ams1 postfix/lmtp[15520]: 0A87094F8G5: to=<in Any tips or push in the right direction would be greatly appreciated! Regards, Jeremy
Your server is identifying as webserver1.webservice.com, which apparently isn't resolvable. Probably adding to dns would be a quick and easy solution for that, though there are many: you could change it's name, or configure it to identify as a different name, or add that name to dns (or even your server's hosts file might work), or disable unknown hostname rejection. If you upgrade to a nightly build (or copy the smtpd_helo_restrictions from it) you even get a few more options: add that server's address to mynetworks, or configure the sites to send with authentication, or configure the webserver hostname in /etc/postfix/helo_access.
Did but couldn't find anything out of the ordinary. I got the following Code: ##### SERVER ##### IP-address (as per hostname): ***.***.***.*** [WARN] could not determine server's ip address by ifconfig [INFO] OS version is Ubuntu 18.04.5 LTS [INFO] uptime: 17:51:17 up 6 min, 1 user, load average: 0.58, 0.63, 0.33 [INFO] memory: total used free shared buff/cache available Mem: 7.8G 3.4G 2.8G 274M 1.4M 3.6G Swap: 0B 0B 0B [INFO] ISPConfig is installed. ##### ISPCONFIG ##### ISPConfig version is 3.2.2 ##### VERSION CHECK ##### [INFO] php (cli) version is 7.0.33-38+ubuntu16.04.1+deb.sury.org+1 ##### PORT CHECK ##### [WARN] Port 8080 (ISPConfig) seems NOT to be listening ##### MAIL SERVER CHECK ##### ##### RUNNING SERVER PROCESSES ##### [INFO] I found the following web server(s): Unknown process (nginx:) (PID 1261) [INFO] I found the following mail server(s): Postfix (PID 2400) [INFO] I found the following pop3 server(s): Dovecot (PID 1119) [INFO] I found the following imap server(s): Dovecot (PID 1119) [INFO] I found the following ftp server(s): PureFTP (PID 1565) ##### LISTENING PORTS ##### (only () Local (Address) [localhost]:10023 (1328/postgrey) [localhost]:10024 (2478/amavisd-new) [localhost]:10025 (2400/master) [localhost]:10026 (2478/amavisd-new) [localhost]:10027 (2400/master) [anywhere]:587 (2400/master) [localhost]:6379 (1223/redis-server) [localhost]:11211 (1147/memcached) [anywhere]:110 (1119/dovecot) [anywhere]:143 (1119/dovecot) [anywhere]:80 (1261/nginx:) [anywhere]:465 (2400/master) [anywhere]:8081 (1261/nginx:) [anywhere]:21 (1565/pure-ftpd) ***.***.***.***:53 (1137/named) [localhost]:53 (1137/named) ***.***.***.***:53 (848/systemd-resolve) [anywhere]:22 (1171/sshd) [anywhere]:25 (2400/master) [localhost]:953 (1137/named) [anywhere]:443 (1261/nginx:) [anywhere]:993 (1119/dovecot) [anywhere]:995 (1119/dovecot) *:*:*:*::*:10024 (2478/amavisd-new) *:*:*:*::*:10026 (2478/amavisd-new) *:*:*:*::*:3306 (1267/mysqld) *:*:*:*::*:587 (2400/master) *:*:*:*::*:6379 (1223/redis-server) [localhost]10 (1119/dovecot) [localhost]43 (1119/dovecot) *:*:*:*::*:80 (1261/nginx:) *:*:*:*::*:465 (2400/master) *:*:*:*::*:8081 (1261/nginx:) *:*:*:*::*:21 (1565/pure-ftpd) *:*:*:*::*:53 (1137/named) *:*:*:*::*:22 (1171/sshd) *:*:*:*::*:25 (2400/master) *:*:*:*::*:953 (1137/named) *:*:*:*::*:443 (1261/nginx:) *:*:*:*::*:993 (1119/dovecot) *:*:*:*::*:995 (1119/dovecot) ##### IPTABLES ##### Chain INPUT (policy ACCEPT) target prot opt source destination f2b-sshd tcp -- [anywhere]/0 [anywhere]/0 multiport dports 22 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain f2b-sshd (1 references) target prot opt source destination REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable REJECT all -- ***.***.***.*** [anywhere]/0 reject-with icmp-port-unreachable RETURN all -- [anywhere]/0 [anywhere]/0
Managed to solve it. Found an error in the hostname of my postfix's main.cf file Thanks for the help, definitely helped me find the issue.
