Configuring Postfix as a Null Client<\/p>\n
This howto assumes that the relay server\u2019s IP address is 192.168.1.22 and is running RHEL\/CentOS 7. Only mail from the 192.168.1.0\/24 network should be accepted and relayed.<\/p>\n
Install Postfix
\n[root@rhce-server ~]# yum install postfix<\/p>\n
Configure Systemd
\n[root@rhce-server ~]# systemctl enable postfix
\n[root@rhce-server ~]# ^enable^start<\/p>\n
Configure the Firewall
\n[root@rhce-server ~]# firewall-cmd –add-service=smtp
\nsuccess
\n[root@rhce-server ~]# firewall-cmd –add-service=smtp –permanent
\nsuccess<\/p>\n
Configure Postfix<\/p>\n
Postfix\u2019s main configuration file is located at \/etc\/postfix\/main.cf.<\/p>\n
Configure Postfix to listen on the correct interface.
\ninet_interfaces = all<\/p>\n
Configure the trusted network.
\nmynetworks = 192.168.1.0\/24<\/p>\n
Configure the list of domains that this Postfix service should consider itself the final destination for. In my case the server is named rhce-server.
\nmydestination = rhce-server, localhost.localdomain, localhost<\/p>\n
Configure all mail not destined for this server to be relayed to another SMTP server.\u00a0 The brackets tell Postfix to turn off MX lookups.
\nrelayhost = [smtp-server.rmohan.com]<\/p>\n
Restart Postfix
\n[root@rhce-server postfix]# systemctl restart postfix<\/p>\n
Send a Test Email
\n[root@rhce-server postfix]# mail -s “rhce-server test” josh@example.com
\ntesting our null postfix configuration
\n.
\nEOT<\/p>\n
With any luck we should be all set. You can verify the mail was successfully relayed in \/var\/log\/maillog.<\/p>\n","protected":false},"excerpt":{"rendered":"
Configuring Postfix as a Null Client<\/p>\n
This howto assumes that the relay server\u2019s IP address is 192.168.1.22 and is running RHEL\/CentOS 7. Only mail from the 192.168.1.0\/24 network should be accepted and relayed.<\/p>\n
Install Postfix [root@rhce-server ~]# yum install postfix<\/p>\n
Configure Systemd [root@rhce-server ~]# systemctl enable postfix [root@rhce-server ~]# ^enable^start<\/p>\n
Configure the Firewall [root@rhce-server ~]# […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5628"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5628"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5628\/revisions"}],"predecessor-version":[{"id":5629,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5628\/revisions\/5629"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}