Email Services: Configuring Postfix

1. First, we should check out what our hostname and domain are:

hostnamectl

2. With that information recorded in our notes we can elevate to root and verify postfix is installed:

sudo -i
rpm -q postfix

3. Now we can configure postfix:

sudo vim /etc/postfix/main.cf

4. Scroll down until we find the myhostname variable. We can set that to “server1.example.com”.

5. Set the mydomain variable to “example.com”

6. Search for the mail_spool_directory variable and uncomment the one that says “/var/mail”

7. Save and quit, then restart postfix.

sudo systemctl restart postfix

This task requires understanding how email servers communicate.

1. Enter in the following commands in order to send the email:

   1. telnet localhost 25
      

   2. ehlo localhost
      

   3. mail from: [email protected]
      

   4. rcpt to: cloud_user
      

   5. data
      

   6. Subject: Test email
      

   7. test
      

   8. To close out of composing the message, place a . on a new line and press return. Then use: Ctrl + ] and press return Then type: close and press return

   9. Check to see that the e-mail sent:

sudo tail /var/log/maillog

Look for the current data, and then confirmation that an e-mail was received.

1. Change to the mail directory:

cd /var/mail/