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--- linux_wiki:configure_a_system_to_forward_all_email_to_a_central_mail_server [2016/10/04 23:43]
billdozor
+++ linux_wiki:configure_a_system_to_forward_all_email_to_a_central_mail_server [2019/05/25 23:50] (current)
@@ Line 8: / Line 8: @@
 **You will be expected to configure a null client only**. (server that forwards mail but does not receive any)
+----
+====== Lab Setup ======
+The following virtual machines will be used:
+  * server1.example.com (192.168.1.150) -> Configure SMTP null client (**on the exam**)
+  * server2.example.com (192.168.1.151) -> Configure central mail server for client testing (**NOT on the exam**)
 ----
@@ Line 32: / Line 40: @@
 \\
 Configure postfix parameters
+  * Option A: Use postconf (faster if you have an idea what parameters you need to configure)<code bash># check a setting
+postconf relayhost
-  * Option A: Edit the main configuration<code bash>vim /etc/postfix/main.cf
+# check all settings
+postconf | grep <keyword>
+# configure - important
+postconf -e 'relayhost = [192.168.1.151]'
+# configure - probably already defaults (or set to localhost)
+postconf -e 'inet_interfaces = loopback-only'
+postconf -e 'mydestination ='
+postconf -e 'mydomain = example.com'
+</code>
+  * Option B: Edit the main configuration<code bash>vim /etc/postfix/main.cf
 # Relayhost to forward mail to
 relayhost = [192.168.1.151]
-# Forward from loopback interfaces and specify protocol (default is ipv6)
+# Forward from loopback interfaces
 inet_interfaces = loopback-only
-inet_protocols = ipv4
 # Configure destination as blank, because we aren't delivering mail locally (only forwarding outgoing)
@@ Line 47: / Line 67: @@
 # Configure domain
 mydomain = example.com
-# Prevent postfix from putting mail into mail boxes (not required on exam objectives)
-local_transport = error: local delivery disabled</code>
-  * Option B: Use postconf<code bash># check a setting
-postconf relayhost
-# check all settings
-postconf | grep <keyword>
-# configure
-postconf -e 'relayhost = [192.168.1.151]'
-postconf -e 'inet_interfaces = loopback-only'
-postconf -e 'inet_protocols = ipv4'
-postconf -e 'mydestination ='
-postconf -e 'mydomain = example.com'
 </code>
 \\
@@ Line 107: / Line 113: @@
 Edit the main configuration file
 <code bash>
+#-- vim directly
 vim /etc/postfix/main.cf
+# listening interfaces
 inet_interfaces = all
-inet_protocols = ipv4
+# Accept mail for these domains
 mydestination = example.com, server2.example.com, server2
+#-- postconf method
+# check settings
+postconf | grep inet_
+postconf | grep mydestination
+# configure
+postconf -e 'inet_interfaces = all'
+postconf -e 'mydestination = example.com, server2.example.com, server2'
+</code>
+\\
+Check postfix syntax
+<code bash>
+postfix check
 </code>
@@ Line 124: / Line 149: @@
 ====== Null Client Testing ======
-**From server1**.
+**From server1**
 Install a mail client (if not already installed)
@@ Line 134: / Line 159: @@
 Send a test message
 <code bash>
-echo "This is the subject body" | mail -s "This is a postfix forward test" root@server2.example.com
+echo "Did it work?" | mail -s "This is a postfix forward test" root@server2.example.com
 </code>
@@ Line 141: / Line 166: @@
 <code bash>
 tail -f /var/log/maillog
+</code>
+\\
+**From server2**
+On the postfix relayhost, check root's mail
+<code bash>
+mail
 </code>