There was an error in the telnet connection when postfix was testing the native machine.
There is no problem with forward parsing and reverse parsing. The default port of postfix is 25.
Configure the profile for postfix
[root@www:/var/named] # cd / etc/postfix/ [root@www:/etc/postfix] # vim main.cf myhostname = www.crwolf.commyorigin = crwolf.commydomain = crwolf.commydestination = $myhostname, localhost.$mydomain, localhost, $mydomainmynetworks = 192.168.1.0 pick 24, 127.0.0.0 pick 8
Restart postfix and test
[root@www:/etc/postfix] # service postfix restart disable postfix: [OK] start postfix: [OK] [root@www:/etc/postfix] # vim / etc/resolv.conf nameserver 192.168.1.9 point DNS parsing to the native [root@www:/etc/postfix] # telnet mail.crwolf.com 25 Trying 192.168.1.9...telnet: connect to address 192.168.1.9: Connection refused # connection rejection [root@www:/etc/postfix] # telnet localhost 25 # Why is it possible locally? Trying:: 1...Connected to localhost.Escape character is'^] '.220 www.crwolf.com ESMTP Postfix
Check for problems
Check to see if there is a telnet service.
[root@www:/etc/postfix] # cd [root@www:~] # rpm-qa telnettelnet-0.17-48.el6.x86_64 # with [root@www:~] # rpm-qa telnet-server # without [root@www:~] # chkconfig-list xinetd-based service: # xinetd also does not have telnet [root@www:~] # yum install-y telnet-server # download telnet-server [root@www:~] # chkconfig-- list xinetd-based service: telnet: disable
There is telnet now, but the service is turned off. Turn it on.
[root@www:~] # service xinetd restart stop xinetd: [OK] starting xinetd: [OK] [root@www:~] # service telnet starttelnet: unrecognized service [root@www:~] # chkconfig telnet on [root@www:~] # chkconfig-- list based on xinetd Service: telnet: enable [root@www:~] # telnet mail.crwolf.com 25Trying 192.168.1.9...telnet: connect to address 192.168.1.9: Connection refused # or reject
View the configuration of telnet
[root@www:~] # vim / etc/xinetd.d/telnet disable = no # this is received
Take a look at the following configuration file for postfix
[root@www:~] # vim / etc/postfix/main.cf # inet_interfaces does not have $myhostname here, add inet_interfaces = localhost-- > inet_interfaces = localhost, $myhostname [root@www:~] # telnet www.crwolf.com 25 # can connect to Trying 192.168.1.9...Connected to www.crwolf.com.Escape character is'^] '.220 www.crwolf.com ESMTP Postfix
