{"id":1132,"date":"2022-02-10T13:45:41","date_gmt":"2022-02-10T12:45:41","guid":{"rendered":"https:\/\/irg-net.com\/?p=1132"},"modified":"2022-02-10T16:33:42","modified_gmt":"2022-02-10T15:33:42","slug":"configure-postfix-mta-as-send-only-on-debian-10-11","status":"publish","type":"post","link":"https:\/\/irg-net.com\/index.php\/configure-postfix-mta-as-send-only-on-debian-10-11\/","title":{"rendered":"Configure Postfix MTA as Send-Only on Debian 10 \/ 11"},"content":{"rendered":"\n<p>In this guide we\u2019ll look at how you can configure Postfix MTA as a send-only SMTP server on Debian 10\/11, meaning it doesn\u2019t receive and process emails. Its job is only to act as Local mail transfer agent. Postfix is a popular open source\u00a0Mail Transfer Agent (MTA) used in Linux and Unix environments.<\/p>\n\n\n\n<p>A send only mail server is useful especially when used in scripting, e.g having a cron job that sends an email about the status of its execution, or an application that sends an email to you when certain events happen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"configure-postfix-as-a-send-only-smtp-server-on-debian-10-11\">Configure Postfix as a Send-Only SMTP Server on Debian 10\/11<\/h2>\n\n\n\n<p>Installing and configuring\u00a0Postfix as a Send-Only SMTP Server on Debian 11|10 is an easy process. Start by updating your system<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">sudo apt update<\/code><\/pre>\n\n\n\n<p>Also set a hostname for the server so that emails will show a from address with valid domain section.<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">sudo hostnamectl set-hostname smtp.example.com --static<\/code><\/pre>\n\n\n\n<p>Install mailutils package other mail utilities.<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">sudo apt install mailutils<\/code><\/pre>\n\n\n\n<p>Finally install postfix:<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">sudo apt install postfix<\/code><\/pre>\n\n\n\n<p>As the package installs, you\u2019ll be asked to select an option on screen for your mail server. For\u00a0<strong>\u201cGeneral type of email configuration\u201d\u00a0<\/strong>window, select\u00a0<strong>Internet site\u00a0<\/strong>and click\u00a0<strong>OK\u00a0<\/strong>button.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"713\" height=\"541\" src=\"https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132208.jpg?resize=713%2C541&#038;ssl=1\" alt=\"\" class=\"wp-image-1133\" srcset=\"https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132208.jpg?w=713&amp;ssl=1 713w, https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132208.jpg?resize=300%2C228&amp;ssl=1 300w\" sizes=\"auto, (max-width: 713px) 100vw, 713px\" \/><\/figure>\n\n\n\n<p>The next page will ask you to set your\u00a0Mail server name, this can be domain or server hostname with an A record.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1016\" height=\"293\" src=\"https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132953.jpg?resize=1016%2C293&#038;ssl=1\" alt=\"\" class=\"wp-image-1134\" srcset=\"https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132953.jpg?w=1016&amp;ssl=1 1016w, https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132953.jpg?resize=300%2C87&amp;ssl=1 300w, https:\/\/i0.wp.com\/irg-net.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132953.jpg?resize=768%2C221&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1016px) 100vw, 1016px\" \/><\/figure>\n\n\n\n<p>Select\u00a0<strong>OK\u00a0<\/strong>to save the settings and finish the installation.<\/p>\n\n\n\n<div style=\"height:34px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"configure-postfix-mta-server\">Configure Postfix MTA Server<\/h2>\n\n\n\n<p>Edit Postfix configuration file <strong>\/etc\/postfix\/main.cf<\/strong>\u00a0to ensure it is configured as send only ( Only relaying emails from the local server). <\/p>\n\n\n\n<p>Set Postfix to listen on the <strong>127.0.0.1<\/strong>\u00a0loopback interface. The default setting is\u00a0to listen on all interfaces.<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">inet_interfaces = loopback-only<\/code><\/pre>\n\n\n\n<p>Also, set <strong>myhostname\u00a0<\/strong>to your Server FQDN<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">myhostname=smtp.example.com<\/code><\/pre>\n\n\n\n<p>Restart Postfix service for it to pick the new changes,<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">sudo systemctl restart postfix<\/code><\/pre>\n\n\n\n<p>You have successfully installed and configured Postfix as a Send only MTA server on Debian 10\/11. To test email delivery, use the <strong>mail\u00a0<\/strong>command like below<\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:14px\"><code lang=\"python\" class=\"language-python\">echo \"Postfix Send-Only Server\" | mail -s \"Postfix Testing\" userx@example.com<\/code><\/pre>\n\n\n\n<div style=\"height:34px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>And that&#8217;s it, if you have any questions please leave a comment. \ud83d\ude42<\/p>\n\n\n\n<div style=\"height:34px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this guide we\u2019ll look at how you can configure Postfix MTA as a send-only SMTP server on Debian 10\/11, meaning it doesn\u2019t receive and process emails. Its job is only to act as Local mail transfer agent. Postfix is a popular open source\u00a0Mail Transfer Agent (MTA) used in Linux and Unix environments. A send [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[17,1,22],"tags":[],"class_list":["post-1132","post","type-post","status-publish","format-standard","hentry","category-advancedtutorials","category-blog","category-debian"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Configure Postfix MTA as Send-Only on Debian 10 \/ 11 - irgNET<\/title>\n<meta name=\"description\" content=\"In this guide we\u2019ll look at how you can configure Postfix MTA as a send-only SMTP server on Debian 10\/11.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/irgnet-ga3w6nfbvw.live-website.com\/index.php\/configure-postfix-mta-as-send-only-on-debian-10-11\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Configure Postfix MTA as Send-Only on Debian 10 \/ 11 - irgNET\" \/>\n<meta property=\"og:description\" content=\"In this guide we\u2019ll look at how you can configure Postfix MTA as a send-only SMTP server on Debian 10\/11.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/irgnet-ga3w6nfbvw.live-website.com\/index.php\/configure-postfix-mta-as-send-only-on-debian-10-11\/\" \/>\n<meta property=\"og:site_name\" content=\"irgNET\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-10T12:45:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-02-10T15:33:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/irgnet-ga3w6nfbvw.live-website.com\/wp-content\/uploads\/2022\/02\/2022-02-10_132208.jpg\" \/>\n<meta name=\"author\" content=\"H. 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