{"id":11445,"date":"2024-05-25T09:59:05","date_gmt":"2024-05-25T09:59:05","guid":{"rendered":"https:\/\/greenwebpage.com\/community\/?p=11445"},"modified":"2024-10-01T11:45:20","modified_gmt":"2024-10-01T11:45:20","slug":"how-to-configure-smtp-server-on-linux","status":"publish","type":"post","link":"https:\/\/greenwebpage.com\/community\/how-to-configure-smtp-server-on-linux\/","title":{"rendered":"How to Configure SMTP Server on Linux"},"content":{"rendered":"<p><a id=\"post-11445-_heading=h.1fob9te\"><\/a><a href=\"https:\/\/www.smtp.com\/\">SMTP<\/a> is the protocol used for mailing. The SMTP server can be configured by installing Postfix on Linux systems. Postfix is a popular mail transfer agent that effectively manages the sending and receiving of emails on the server.<\/p>\n<p>The main objective of this post is to guide you about the configuration of SMTP servers on Linux-based systems including Ubuntu 24.04.<\/p>\n\n<\/h2>\n<h2><strong>How to configure the SMTP server on Linux?<\/strong><\/h2>\n<p>For configuration of the SMTP server on your Linux-based systems, follow these instructions.<\/p>\n<p><strong>Step 1: Update Your System Packages<\/strong><\/p>\n<p>It is a necessary step for Linux users to make sure that all the system files are updated:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo apt update &amp;&amp; sudo apt upgrade -y<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img fetchpriority=\"high\" decoding=\"async\" width=\"907\" height=\"396\" class=\"wp-image-11446\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-1.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-1.png 907w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-1-300x131.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-1-768x335.png 768w\" sizes=\"(max-width: 907px) 100vw, 907px\" \/><\/pre>\n<p>If needed, the above command will install any available updates for the installed packages.<\/p>\n<p><strong>Step 2: Install Postfix<\/strong><\/p>\n<p>After installing the available updates, you can configure the SMTP server by setting up the Postfix on your Linux-based system:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo apt install postfix -y<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img decoding=\"async\" width=\"913\" height=\"533\" class=\"wp-image-11447\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-2.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-2.png 913w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-2-300x175.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-2-768x448.png 768w\" sizes=\"(max-width: 913px) 100vw, 913px\" \/><\/pre>\n<p>While setting up the Postfix package, you will be prompted with a few questions. Respond to them accordingly:<\/p>\n<p><img decoding=\"async\" width=\"907\" height=\"598\" class=\"wp-image-11448\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-3.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-3.png 907w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-3-300x198.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-3-768x506.png 768w\" sizes=\"(max-width: 907px) 100vw, 907px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"909\" height=\"603\" class=\"wp-image-11449\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-4.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-4.png 909w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-4-300x199.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-4-768x509.png 768w\" sizes=\"(max-width: 909px) 100vw, 909px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"905\" height=\"595\" class=\"wp-image-11450\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-5.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-5.png 905w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-5-300x197.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-5-768x505.png 768w\" sizes=\"(max-width: 905px) 100vw, 905px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"915\" height=\"509\" class=\"wp-image-11451\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-6.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-6.png 915w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-6-300x167.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-6-768x427.png 768w\" sizes=\"(max-width: 915px) 100vw, 915px\" \/><\/p>\n<p>Installing Postfix on a Linux server is essential for setting up a reliable and secure SMTP server.<\/p>\n<p>You can further edit the \u201c\/etc\/postfix\/main.cf\u201d file according to your needs.<\/p>\n<p><strong>Step 3: Backup Postfix Configuration <\/strong><\/p>\n<p>Before making changes to the main configuration file of Postfix, it is better to create a backup of the Postfix main configuration file:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo cp \/etc\/postfix\/main.cf \/etc\/postfix\/main.cf.backup<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"909\" height=\"49\" class=\"wp-image-11452\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-7.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-7.png 909w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-7-300x16.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-7-768x41.png 768w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-7-900x49.png 900w\" sizes=\"(max-width: 909px) 100vw, 909px\" \/><\/pre>\n<p>The above command created a backup copy of the main configuration file. Now, you can safely edit the file.<\/p>\n<p><strong>Step 4: Edit the Postfix Configuration<\/strong><\/p>\n<p>Let\u2019s make some necessary changes in the main Postfix configuration file. Run the command to open the file:<\/p>\n<table>\n<thead>\n<tr>\n<th>sudo nano \/etc\/postfix\/main.cf<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"894\" height=\"49\" class=\"wp-image-11453\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-8.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-8.png 894w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-8-300x16.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-8-768x42.png 768w\" sizes=\"(max-width: 894px) 100vw, 894px\" \/><\/p>\n<p>In the Postfix configuration file, locate the \u201cinet_interfaces\u201d parameter and update it with the following option:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>inet_interfaces = loopback-only<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"909\" height=\"604\" class=\"wp-image-11454\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-9.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-9.png 909w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-9-300x199.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-9-768x510.png 768w\" sizes=\"(max-width: 909px) 100vw, 909px\" \/><\/pre>\n<p>Save the Postfix configuration file using Ctrl + S and return to the main terminal window.<\/p>\n<p><strong>Step 5: Enable Postfix<\/strong><\/p>\n<p>Use this command to automatically start the Postfix service when the system reboots:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo systemctl enable postfix<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"916\" height=\"120\" class=\"wp-image-11455\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-10.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-10.png 916w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-10-300x39.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-10-768x101.png 768w\" sizes=\"(max-width: 916px) 100vw, 916px\" \/><\/pre>\n<p>If you see the above message \u201cenable postfix\u201d, it means that the Postfix is now enabled on your Linux system.<\/p>\n<p><strong>Step 6: Start Postfix<\/strong><\/p>\n<p>Execute the provided command to start the Postfix service immediately, without rebooting the system:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo systemctl start postfix<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"898\" height=\"51\" class=\"wp-image-11456\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-11.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-11.png 898w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-11-300x17.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-11-768x44.png 768w\" sizes=\"(max-width: 898px) 100vw, 898px\" \/><\/pre>\n<p>After executing this command, you don&#8217;t need to reboot your system to apply the changes to the Postfix.<\/p>\n<p><strong>Step 7: Allow Postfix Firewall<\/strong><\/p>\n<p>Run the following three commands to allow the firewall for Postfix SMTPS access.<\/p>\n<p>This command will allow Postfix:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo ufw allow Postfix<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"875\" height=\"95\" class=\"wp-image-11457\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-12.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-12.png 875w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-12-300x33.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-12-768x83.png 768w\" sizes=\"(max-width: 875px) 100vw, 875px\" \/><\/pre>\n<p>You can utilize this command to allow Postfix SMTPS on your Linux system:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo ufw allow \"Postfix SMTPS\"<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"884\" height=\"97\" class=\"wp-image-11458\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-13.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-13.png 884w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-13-300x33.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-13-768x84.png 768w\" sizes=\"(max-width: 884px) 100vw, 884px\" \/><\/pre>\n<p>Run the command to allow Postfix to accept incoming email submissions from clients:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo ufw allow \"Postfix Submission\"<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"901\" height=\"98\" class=\"wp-image-11459\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-14.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-14.png 901w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-14-300x33.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-14-768x84.png 768w\" sizes=\"(max-width: 901px) 100vw, 901px\" \/><\/pre>\n<p>These commands are essential to allow traffic for Postfix, SMTPS, and email submissions from clients through the firewall.<\/p>\n<p><strong>Step 8: Restart Postfix<\/strong><\/p>\n<p>Your Linux machine now needs to restart the Postfix service for the changes to take effect:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>sudo systemctl restart postfix.service<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<pre><img loading=\"lazy\" decoding=\"async\" width=\"899\" height=\"49\" class=\"wp-image-11460\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-15.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-15.png 899w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-15-300x16.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-15-768x42.png 768w\" sizes=\"(max-width: 899px) 100vw, 899px\" \/><\/pre>\n<p>After executing the command, if you see no output on your screen, it indicates that the Postfix service has started successfully.<\/p>\n<p><strong>Step 9: Test SMTP Server on Your Linux <\/strong><\/p>\n<p>Let\u2019s test the Postfix SMTP server using the following commands:<\/p>\n<table>\n<thead>\n<tr>\n<th>\n<pre>telnet localhost 25 \n\nEHLO localhost \nMAIL FROM:you@example.com \nRCPT TO:recipient@example.com \nDATA \nSubject: Test Email \n\nThis is a Test email for Postfix. \n. \nQUIT<\/pre>\n<\/th>\n<\/tr>\n<\/thead>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"902\" height=\"555\" class=\"wp-image-11461\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-16.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-16.png 902w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-16-300x185.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-16-768x473.png 768w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-16-900x555.png 900w\" sizes=\"(max-width: 902px) 100vw, 902px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"907\" height=\"247\" class=\"wp-image-11462\" src=\"http:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-17.png\" srcset=\"https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-17.png 907w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-17-300x82.png 300w, https:\/\/greenwebpage.com\/community\/wp-content\/uploads\/2024\/05\/word-image-11445-17-768x209.png 768w\" sizes=\"(max-width: 907px) 100vw, 907px\" \/><\/p>\n<p>When you run the above commands and observe the same output as mentioned above, it indicates that the SMTP server has been successfully configured on the Linux system.<\/p>\n<h2><strong>Conclusion<\/strong><\/h2>\n<p>SMTP server can be configured by setting up the Postfix on your Linux-based system. To install Postfix, use the command \u201csudo apt install postfix -y\u201d and do some necessary edits in the \u201c\/etc\/postfix\/main.cf\u201d configuration file. You can test the SMTP server by using the command \u201ctelnet localhost 25\u201d on your Linux machine (i.e. Ubuntu 24.04).<\/p>\n\n\n<p><\/p>\n\n    <div class=\"xs_social_share_widget xs_share_url after_content \t\tmain_content  wslu-style-1 wslu-share-box-shaped wslu-fill-colored wslu-none wslu-share-horizontal wslu-theme-font-no wslu-main_content\">\n\n\t\t\n        <ul>\n\t\t\t        <\/ul>\n    <\/div> \n","protected":false},"excerpt":{"rendered":"<p>SMTP is the protocol used for mailing. The SMTP server can be configured by installing Postfix on Linux systems. Postfix is a popular mail transfer agent that effectively manages the sending and receiving of emails on the server. The main objective of this post is to guide you about the configuration of SMTP servers on [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11466,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[230,319,317],"class_list":["post-11445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-linux","tag-smtp-server","tag-ubuntu-24-04"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Configure SMTP Server on Linux - Greenwebpage Community<\/title>\n<meta name=\"description\" content=\"The main objective of this post is to guide you about the configuration of SMTP servers on Linux-based systems including Ubuntu 24.04.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/greenwebpage.com\/community\/how-to-configure-smtp-server-on-linux\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Configure SMTP Server on Linux - 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