Postfix configuration

It is in Ubuntu's main repository, which means that it receives security updates. This guide explains how to install and configure postfix and set it up as an SMTP server using a secure connection.

If you worked for a company named Acme and owned acme. Employees could send and receive email through your computer, but not without your computer running all the time. If all your email addresses are at a domain gmail.

For example: sudo apt-get install postfix Simply accept the defaults when the installation process asks questions. The configuration will be done in greater detail in the next stage.

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Configuration From a terminal prompt: sudo dpkg-reconfigure postfix Insert the following details when asked replacing server1. By default Postifx will use mbox for the mailbox format. Rather than editing the configuration file directly, you can use the postconf command to configure all postfix parameters. Later if you wish to re-configure a particular parameter, you can either run the command or change it manually in the file.

First you will need to install the libsaslsasl2-bin and libsasl2-modules from the Main repository [i. Note: if you are using Ubuntu 6. We have to change a few things to make it work properly. This will use MD5 hashed password transfer and is perfectly secure.

The username and password needed to authenticate will be those of the users on the system you are using on the server.

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You can ignore this because when you start saslauthd next it will be created. Update by dominique-ramaekers: On On starting the service I got this error: "saslauthd[] :main : no authentication mechanism specified". The link fixes this issue. Type quit to return to the system's shell. Troubleshooting Remove Postfix from chroot If you run into issues while running Postfix you may be asked to remove Postfix from chroot to better diagnose the problem.

If you are new to Postfix it is recomended to follow this guide first. This allows your server to reject mail from unauthorized sources. This will allow your server to sign and verify emails using DKIM. Add Dspam to Postfix Postfix Dspam will guide you through the setup process of dspam for you existing Postfix installation. This will enable on your mail server high quality statistical spam filter Dspam.

Postfix Complete Solution Postfix Complete Virtual Mail System Howto will help you if you are managing a large number of virtual domains at an ISP level or in a large corporation where you mange few hundred or thousand mail domains. Note: this guide has been tested on Ubuntu 6. Partners Support Community Ubuntu.NOTE: naturally, this is not an exhaustive Postfix tutorial.

Also, some parts may not apply to your case. Restart your server, and check the logs: you should be getting mentions of TLS now. For instance, an email server starting an encrypted connection to yours looks like:. Great tutorial — nicely sized and runs through the essentials well. May be worth noting for users of a null client however, that the outbound SSL configuration or the submission block in the master. With the configuration above, you should have TLSv1, v1.

If you really want to disable TLSv1 probably safe these days; on my email server, only spam bots typically use anything lower than v1. You may also need a newer Postfix than the one that came with your system. This site uses Akismet to reduce spam. Learn how your comment data is processed. Gmail will communicate with you and you with them with encryption. Like this: Like Loading Very good tutorial.

Any help will be appreciated.

Multiple Domains & Virtual Mailboxes in Postfix Tutorials Online at Networknuts

Hi ZurglThanks for your prompt answer! Leave a Reply Cancel reply.In this tutorial, you will learn how to install and configure a Postfix server to send email through Mandrill, or SendGrid.

During the installation, a prompt will appear asking for your General type of mail configuration. If you want to use Mandrillor SendGrid as your SMTP provider, you may want to reference the appropriate example while working on this section. For security reasons, you should change their permissions so that only the root user can read or write to the file. Run the following commands to change the ownership to root and update the permissions for the two files:.

Update the relayhost parameter to show your external SMTP relay host. The fastest way to test your configuration is to send an email to any unrelated email address, using the mail command:.

postfix configuration

This section shows you settings for some popular mail services you can use as external SMTP servers. You may have to do some fine-tuning on your own to avoid Postfix logins being flagged as suspicious. Find answers, ask questions, and help others. Your feedback is important to us. Let us know if this guide helped you find the answer you were looking for.

postfix configuration

Sign Up Here! This guide was originally written for Debian 7. It has since been tested to work with Debian 9.

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This guide may involve or result in sending email. In an effort to fight spam, Linode restricts outbound connections on ports 25,and on all Linodes for new accounts created after November 5th, For more information, please see Sending Email on Linode.

This guide is written for a non-root user. Commands that require elevated privileges are prefixed with sudo. Search guides and tutorials. RSS feed. Monthly Guides Update. Was This Guide Helpful? Take the Survey. Image Detail.We use cookies on our websites to deliver our online services.

postfix configuration

Details about how we use cookies and how you may disable them are set out in our Privacy Statement. By using this website you agree to our use of cookies. Posted October 24, by Gabby Taylor. 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. 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.

If the previous command shows that the RPM is not installed, you can install the Postfix RPM with the following on yum -based distros :. After Postfix is installed, you can start the service and enable it to make sure it starts after reboot:. After Postfix is installed, you can start configuring the service to your liking. 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:. 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.

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:. 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:. In order to finish the message body and close it, you need to add a single period. 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. In any regard, check the mail logs for errors. 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.

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 this via the openssl command:. 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. More about me. Enable Sysadmin. How to install and configure Postfix. Learn how to install and configure Postfix, which is a Sendmail-compatible mail transport agent that is designed to be secure, fast, and easy to configure.Get the latest tutorials on SysAdmin and open source topics.

Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city. Become an author. Postfix is a mail transfer agent MTAan application used to send and receive email.

In this tutorial, we will install and configure Postfix so that it can be used to send emails by local applications only — that is, those installed on the same server that Postfix is installed on. However, if you manage a cloud server on which you have installed applications that need to send email notifications, running a local, send-only SMTP server is a good alternative to using a 3rd party email service provider or running a full-blown SMTP server.

One Ubuntu A valid domain name, like example. You can set that up by following this host name tutorial. The output should match the name you gave the Droplet when it was being created. The most efficient way to install Postfix and other programs needed for testing email is to install the mailutils package.

Finally, install Postfix. Installing mailtuils will install Postfix as well as a few other programs needed for Postfix to function. Near the end of the installation process, you will be presented with a window that looks exactly like the one in the image below.

The default option is Internet Site. The System mail name should be the same as the name you assigned to the server when you were creating it. If it shows a subdomain like subdomain. For that to happen, Postfix needs to be configured to listen only on the loopback interfacethe virtual network interface that the server uses to communicate internally.

To make the change, open the main Postfix configuration file using nano or your favorite text editor. By default, the values are similar to these:.

The recommended defaults for that scenario are given in the code block below, so modify yours to match:. However, to configure Postfix in a manner that scales and that does not present issues for such a setup involves additional configurations that are beyond the scope of this article. In performing your own test syou may use the body and subject line text as-is, or change them to your liking. The domain part can be gmail. Now check the email address where you sent the test message.

You should see the message in your inbox. If not, check your spam folder. Note that with this configuration, the address in the From field for the test emails you send will be sammy example.

If you change your username, the From address will also change. With that setting, system generated emails are sent to the root user. What you want to do is edit it so that those emails are rerouted to your email address. To accomplish that, edit the file so that it reads:. When finished, save and close the file. For the change to take effect, run the following command:.This brief tutorial shows students and new users how to install and configure Postfix mail server on Ubuntu For the uninitiated, Postfix an open-source and free mail transfer agent that routes and delivers emails.

It focuses on security and can be installed on most Linux systems, including Ubuntu using a simple command. Students and new user looking for a Linux system to start learning on, the easiest place to start is Ubuntu Linux OS…. Ubuntu is an open source Linux operating systems that runs on desktops, laptops, server and other devices…. Both Ubuntu and Windows systems allow you to be productive, easy to use, reliable and enable you to install and run thousands of programs from gaming to productivity suite software for individuals and businesses.

When prompted whether to except the packages that will be downloaded and installed, type y for Yes. Once the installation is complete, you can stop, start and enable the service using the commands below:.

Then enable command enables the service to automatically start up everytime the system boots up. Just like many other mail servers, Postfix comes with lots of different configuration options. Some are basic while others are more advanced. Majority of Postfix settings are found this configuration file.


There are three to four main configuration options that are mostly configured in a live environment: myhostname, mydestination, mynetworks and mail home folder. Besides the configuration options above, Postfix also comes with a self-signed certificate settings that come configured on the system.

Postfix self-signed SSL certificate settings are located in the same configuration file mentioned above. For more advanced configuration, you may have to review files in its main directory for help.

When connecting to the service for the first time, you will receive a warning message because they are self-signed and not CA certificates. This post shows you how to install and configure Postfix mail server on Ubuntu.

If you find any error above, please use the comment form below to report it. Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content. This tutorial is going to show you how…. To get Postfix installed, run the commands below: sudo apt update sudo apt install postfix When prompted whether to except the packages that will be downloaded and installed, type y for Yes.

Outgoing mail is sent using a smarthost. There is no network. Next choose a domain name for the mail system. Step 2: Configure Postfix Now that Postfix is installed, move below to learn how to configure it. These are details for some of the configurations above: myhostnme: describes the mail server hostname or system name… normally its fully qualified hostname: mailsr.

Conclusion: This post shows you how to install and configure Postfix mail server on Ubuntu. Leave a Reply Cancel reply Your email address will not be published.Edit this article. Buy Now. After you have installed Postfix, you can work with settings in the main.

Note: This article assumes that you are using a single domain for your email needs. One of the key aspects of Postfix is that it is designed to be a modular package. You can begin to see the modular nature of Postfix when you look at the main.

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Many settings refer to other files on the server. This setup can seem slightly confusing at first, and your initial reaction might be to hard code the data rather than reference another file with a single word in it. However, we recommend retaining the modularity of Postfix and editing multiple files for what might seem like simple settings. Such modularity will be useful when you start adding multiple domains, users, and aliases to your setup.

The file consists of basically three sections. The second section has settings for TLS parameters. This article focuses on the last section, which looks as follows on the democloud server:. Note : Some of the settings already have the host name from the base Postfix installation.

Configure Postfix to Send Mail Using an External SMTP Server

Although some of the settings might be self-explanatory, the following sections describe them so that you can get a better understanding of Postfix and what you can do with it.

The myhostname value was set during the Postfix installation when you entered the domain name that you want to use. This name also matches the cloud server host name. Aliases provide a method for delivering mail to different users without having to set up dozens of different accounts.

Debugging Postfix Config, Mail Logs & more

The default settings in the main. The file shows a list of names followed by root. Mail delivered to the first name is actually delivered to the second name. You do not need to set up the postmasternewswebmasterabuseand other users for Postfix because mail delivered to those names is sent to root. Using the same syntax, you can have all mail for root delivered to the admin user by adding the following line demo is the main admin user for the democloud server :.

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