{"id":9594,"date":"2014-02-25T10:10:47","date_gmt":"2014-02-25T09:10:47","guid":{"rendered":"https:\/\/www.credativ.de\/?p=9594"},"modified":"2025-08-27T09:14:42","modified_gmt":"2025-08-27T07:14:42","slug":"postfix-architecture-overview","status":"publish","type":"post","link":"https:\/\/www.credativ.de\/en\/blog\/howtos-en\/postfix-architecture-overview\/","title":{"rendered":"Postfix Architecture Overview"},"content":{"rendered":"<div class=\"submitted\"><em>The Postfix mail transport agent consists of several subcomponents, services, and queues, which are listed in detail in the documentation. We have transferred the most important functions to a diagram for greater clarity.<\/em><\/div>\n<div class=\"content\">\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p>The page <a title=\"Postfix Architecture Overview\" href=\"http:\/\/www.postfix.org\/OVERVIEW.html\">postfix.org\/OVERVIEW.html<\/a> presents and explains the individual parts of Postfix and their functions: services, queues, etc. Although some of the relationships are outlined in a schematic ASCII overview, there is no overall overview. To facilitate understanding of Postfix and make it easier to get started with the topic, we have created this overview as far as possible based on the information on the page:<\/p>\n<p><a href=\"https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1748\" src=\"https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-212x300.png\" alt=\"Postfix-Overview\" width=\"353\" height=\"500\" srcset=\"https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-212x300.png 212w, https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-180x255.png 180w, https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-768x1087.png 768w, https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-724x1024.png 724w, https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview-600x849.png 600w, https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview.png 1190w\" sizes=\"auto, (max-width: 353px) 100vw, 353px\" \/><\/a><\/p>\n<p>The graphic is also available as a <a title=\"Postfix Architecture Overview, PDF\" href=\"https:\/\/github.com\/liquidat\/PostfixArchitectureOverview\/raw\/master\/Postfix-Overview.pdf\">PDF<\/a>.<\/p>\n<p>However, it should be noted that the diagram does not take into account all connections and relationships. For example, the flush process is greatly simplified, as communication with smtpd and qmgr is not shown. The integration of policyd&#8217;s, such as for greylisting, is also missing.<\/p>\n<p>The sources in ODG format are stored in a <a title=\"Github repo\" href=\"https:\/\/github.com\/liquidat\/PostfixArchitectureOverview\">Github repository<\/a> \u2013 unfortunately, however, the paths in the ODG file do not seem to be particularly stable. Many thanks again to Patrick Ben Koetter for the original idea to create such an image!<br \/>\n&nbsp;<\/p>\n<p style=\"text-align: center;\"><em>This article was originally written by Roland Wolters.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Postfix mail transport agent consists of several subcomponents, services, and queues, which are listed in detail in the documentation. We have transferred the most important functions to a diagram for greater clarity. The page postfix.org\/OVERVIEW.html presents and explains the individual parts of Postfix and their functions: services, queues, etc. Although some of the relationships [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_improvement_type_select":"improve_an_existing","_thumb_yes_seoaic":false,"_frame_yes_seoaic":false,"seoaic_generate_description":"","seoaic_improve_instructions_prompt":"","seoaic_rollback_content_improvement":"","seoaic_idea_thumbnail_generator":"","thumbnail_generated":false,"thumbnail_generate_prompt":"","seoaic_article_description":"","seoaic_article_subtitles":[],"footnotes":""},"categories":[1885],"tags":[1780],"class_list":["post-9594","post","type-post","status-publish","format-standard","hentry","category-howtos-en","tag-email-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Postfix Architecture Overview - credativ\u00ae<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.credativ.de\/en\/blog\/howtos-en\/postfix-architecture-overview\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Postfix Architecture Overview\" \/>\n<meta property=\"og:description\" content=\"The Postfix mail transport agent consists of several subcomponents, services, and queues, which are listed in detail in the documentation. We have transferred the most important functions to a diagram for greater clarity. The page postfix.org\/OVERVIEW.html presents and explains the individual parts of Postfix and their functions: services, queues, etc. Although some of the relationships [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.credativ.de\/en\/blog\/howtos-en\/postfix-architecture-overview\/\" \/>\n<meta property=\"og:site_name\" content=\"credativ\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/credativDE\/\" \/>\n<meta property=\"article:published_time\" content=\"2014-02-25T09:10:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-27T07:14:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.credativ.de\/wp-content\/uploads\/2019\/06\/Postfix-Overview.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1190\" \/>\n\t<meta property=\"og:image:height\" content=\"1684\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Peter Dreuw\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@archandha\" \/>\n<meta name=\"twitter:site\" content=\"@credativde\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Peter Dreuw\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/\"},\"author\":{\"name\":\"Peter Dreuw\",\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/#\\\/schema\\\/person\\\/ee5f7428a89d09bab352fdc86c8edef3\"},\"headline\":\"Postfix Architecture Overview\",\"datePublished\":\"2014-02-25T09:10:47+00:00\",\"dateModified\":\"2025-08-27T07:14:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/\"},\"wordCount\":209,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.credativ.de\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/Postfix-Overview-212x300.png\",\"keywords\":[\"Email\"],\"articleSection\":[\"HowTos\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/#respond\"]}],\"copyrightYear\":\"2014\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/www.credativ.de\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/\",\"url\":\"https:\\\/\\\/www.credativ.de\\\/en\\\/blog\\\/howtos-en\\\/postfix-architecture-overview\\\/\",\"name\":\"Postfix Architecture Overview - 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