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Add the HELO command to tell the server which domain you are coming from: Once this process is complete, you can add TLS options to the Postfix config file: How to install and configure Postfix. Finally, we can add the content of the message. To reach the content mode, we add the prefix DATA on a line by itself, followed by the Subject line, and the body message. Listed below is an example: If the previous command shows that the RPM is not installed, you can install the Postfix RPM with the following (on yum -based distros): The list provided with mynetworks should only contain local network IP addresses, or network/netmask patterns that are separated by commas or whitespace. It’s important to only use local network addresses to avoid unauthorized users using your mail server for malicious activity, resulting in your server and addresses being blacklisted. First, I recommend testing whether you can send an email to a local recipient. If successful, you can proceed to a remote recipient. I prefer to use the telnet command to test my mail server: More Linux resources. This entry is followed by the recipient, and you can add more than one by using the RCPT TO command multiple times: Securing Postfix. Installing Postfix. In order to finish the message body and close it, you need to add a single period (.) or dot on a line by itself. Once this process is complete, the server will attempt to send the email with the information you provided. The code response will notify you if the email was successful or not. Once done, use the quit command to close the mailing window. Before putting something into production, testing it in a dev environment is always a good idea. This process has the same concept: Once you get the mail server configured, test it to make sure that it works. Configuring Postfix. The most commonly used implementations of SMTP in most Linux distros are Sendmail and Postfix. Postfix is an open source mail-transfer agent that was originally developed as an alternative to Sendmail and is usually set up as the default mail server. Then, generate a signing request and copy it to the /etc/postfix directory: After Postfix is installed, you can start the service and enable it to make sure it starts after reboot: First, you need to generate the private key and the Certificate Signing Request (CSR). You can do this via the openssl command: To check on RPM-based distros, use this command: Testing Postfix. Now, you have a functioning, secure email server. Next is the sender. This ID can be added with the MAIL FROM command: Securing your services is just as important as setting them up. It is safer to transfer data over a secure connection than over one that is unprotected. Next, we will cover how to secure our newly configured mail server. You can do that by generating an SSL session over Transport Layer Security (TLS) for the SMTP server. This sequence issues a signed certificate to the mail server, also known as a Certificate Authority (CA) certificate. This practice means that the CA must trust the certificate signer to secure the private key and transmit data over the internet. In the other kind of certificate, a self-signed, the CA does not trust the certificate signer, leaving the information vulnerable to steal and open to be compromised. It’s always better to go with a signed certificate. Posted October 24, 2019 | by Gabby Taylor. Next, restart the service to put the new options into effect: After Postfix is installed, you can start configuring the service to your liking. All of the options you need for the service are located in /etc/postfix . The main configuration file for the Postfix service is located at /etc/postfix/main.configuration . Within the configuration file, there are many options that you can add, some of them more common than others. Let's go over a few you may see the most when setting up the service, and when needing to troubleshooting it: In any regard, check the mail logs for errors. They are located in /var/log/maillog by default, but this location can be changed to another place. As a system administrator, checking error logs is a good habit to have. This practice is great in troubleshooting and gives us insight into identifying and fixing an issue faster. Deciphering mail logs is an important part of admin work as well, as each part of the log lets us know what is important. In my past years, knowing these parts has helped me write scripts for specific requests while only needing to redact or leave out parts of the mail logs. myhostname declares the mail server’s hostname. Hostnames normally have prefixes in them, like this: mydomain declares the domain that is actually handling mail, like this: mail_spool_directory declares the directory where mailbox files are placed, like so: mynetworks declares a list of trusted remote SMTP servers that can relay through the server, like this: Before beginning to install, first things first. A good habit to have is to check and see if the software is installed on the server already. It’s always helpful to check if something is there before getting to work.

 

 

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