{"id":12092,"date":"2024-07-29T18:20:59","date_gmt":"2024-07-29T16:20:59","guid":{"rendered":"https:\/\/www.efidem.com\/?p=12092"},"modified":"2026-01-13T17:20:15","modified_gmt":"2026-01-13T16:20:15","slug":"smtp-server-email-security-deliverability","status":"publish","type":"post","link":"https:\/\/www.efidem.com\/en\/blog\/2024\/07\/29\/serveur-smtp-email-securite-delivrabilite\/","title":{"rendered":"SMTP server, deliverability, security: What is it and why do you need it?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"12092\" class=\"elementor elementor-12092\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-981ba0e e-flex e-con-boxed e-con e-parent\" data-id=\"981ba0e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8a42eae elementor-widget elementor-widget-heading\" data-id=\"8a42eae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Introduction to the SMTP Server<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e5a32ba elementor-widget elementor-widget-heading\" data-id=\"e5a32ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is an SMTP server and what is it used for? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5576d4a elementor-widget elementor-widget-text-editor\" data-id=\"5576d4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"389\" data-end=\"844\">A <a href=\"https:\/\/www.efidem.com\/en\/powerful-french-emailing-software\/smtp-relay\/\">SMTP server<\/a> is a key component in the email sending process. Specifically, it is a server that handles the routing of your messages to the recipients' mail servers. Instead of sending an email directly from your own server to the final recipient, you go through a server that manages the transmission, routing, and technical compliance of your messages for you.<\/p><p data-start=\"846\" data-end=\"992\">This relay acts as a <strong data-start=\"870\" data-end=\"894\">reliable intermediary<\/strong> between the sender and the internet network. It handles crucial functions such as:<\/p><ul data-start=\"993\" data-end=\"1225\"><li data-start=\"993\" data-end=\"1034\"><p data-start=\"995\" data-end=\"1034\">The management of dispatch queues,<\/p><\/li><li data-start=\"1035\" data-end=\"1086\"><p data-start=\"1037\" data-end=\"1086\">The retry attempt in case of temporary failure,<\/p><\/li><li data-start=\"1087\" data-end=\"1164\"><p data-start=\"1089\" data-end=\"1164\">Application of authentication signatures (such as <a href=\"https:\/\/support.efidem.com\/support\/solutions\/articles\/101000426336-configurer-dkim-et-spf?_gl=1*29hqmt*_gcl_au*MjA1MTgwMjcyOC4xNzY2NDk5NzQ5*_ga*MTM5NTYxNjM2My4xNzU4NzE3MTg3*_ga_HGG37NGQHJ*czE3Njc3OTMzOTkkbzIwNCRnMSR0MTc2Nzc5NTE0OSRqMjAkbDAkaDEyNDI3ODc1MTM.\" rel=\"nofollow noopener\" target=\"_blank\"><strong data-start=\"1143\" data-end=\"1151\">DKIM<\/strong><\/a> or SPF),<\/p><\/li><li data-start=\"1165\" data-end=\"1225\"><p data-start=\"1167\" data-end=\"1225\">Error tracking and deliverability statistics.<\/p><\/li><\/ul><p data-start=\"1227\" data-end=\"1613\">For companies, going through this intermediary<strong data-start=\"1263\" data-end=\"1292\">\u00a0professional<\/strong> allows for increased reliability, security, and performance. This avoids overloading one's own internal server while also complying with the standards imposed by email providers such as Gmail, Outlook, Yahoo, etc., which\u00a0<a href=\"https:\/\/www.efidem.com\/en\/gmail-shielded-future-emailing-and-deliverability\/\" target=\"_blank\" rel=\"noopener\">filters\u00a0<\/a>more and more strictly unauthenticated or misconfigured emails.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d15d63e elementor-widget elementor-widget-heading\" data-id=\"d15d63e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">SMTP Server SMTP Operation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4941643 elementor-widget elementor-widget-text-editor\" data-id=\"4941643\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Email is an indispensable tool for modern communication. Whether for personal exchanges, automated notifications, or strategic professional communications, we send and receive emails daily. This apparent simplicity actually masks a sophisticated technical infrastructure. One of the central elements of this architecture is the <strong data-start=\"557\" data-end=\"575\">SMTP server protocol<\/strong> (Simple Mail Transfer Protocol), which plays an essential role in routing messages from one server to another. This protocol, often invisible to users, is at the heart of how email works.<\/p><p>In this article, we invite you to discover what this protocol is, an SMTP server, how it actually works, and why it is essential to guarantee the reliability and speed of your email shipments. As the volume of exchanged emails has exploded\u2014especially with the automation of\u00a0<a href=\"https:\/\/www.efidem.com\/en\/powerful-french-emailing-software\/\" target=\"_blank\" rel=\"noopener\">marketing campaigns<\/a>\u00a0and transactional messages \u2014 the stakes of <strong data-start=\"1191\" data-end=\"1223\">security and\u00a0<\/strong><a href=\"https:\/\/www.efidem.com\/en\/email-delivery\/\" target=\"_blank\" rel=\"noopener\">deliverability<\/a>\u00a0have become crucial. This is why, for a few years now, the main <strong data-start=\"1302\" data-end=\"1343\">Internet service providers (ISPs)<\/strong> and messaging services have considerably strengthened the <strong data-start=\"1404\" data-end=\"1444\">email security measures<\/strong>. The goal: to better combat fraud, phishing, and identity theft, while ensuring a reliable and secure user experience.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1e3573a elementor-widget elementor-widget-text-editor\" data-id=\"1e3573a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To understand the SMTP server\u00a0<a href=\"https:\/\/www.efidem.com\/en\/efidem-software-saas\/\" target=\"_blank\" rel=\"noopener\">Efidem<\/a>, it's useful to visualize the process of sending an email:<\/p><ol><li><p><strong>Sending message:<\/strong> You compose an email and click \u00abSend.\u00bb Your email client (like Outlook, Gmail, etc.) connects to a server to initiate the sending.<\/p><\/li><li><p><strong>Initial transmission:<\/strong> Your email provider's server receives the message and examines the destination address.<\/p><\/li><li><p><strong>Server relay:<\/strong> If the recipient is not on the same server, the message is relayed through several intermediate servers until it reaches the destination server.<\/p><\/li><li><p><strong>Final delivery<\/strong> The recipient's server delivers the message to their inbox.<\/p><\/li><\/ol><p>Each step of this process uses SMTP commands to ensure the message is correctly transmitted and delivered.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-977ee64 elementor-widget elementor-widget-heading\" data-id=\"977ee64\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why is using the SMTP protocol important?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d64046 elementor-widget elementor-widget-heading\" data-id=\"5d64046\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Comparison with Other Protocols<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-820d1fc elementor-widget elementor-widget-text-editor\" data-id=\"820d1fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>There are other messaging protocols like <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Post_Office_Protocol\" rel=\"nofollow noopener\" target=\"_blank\">POP3<\/a> (Post Office Protocol) and IMAP (Internet Message Access Protocol), but they serve different functions. POP3 and <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Internet_Message_Access_Protocol\" rel=\"nofollow noopener\" target=\"_blank\">IMAP<\/a> are used to receive emails and manage inboxes, while the SMTP protocol is exclusively used to send emails. Together, these protocols work in conjunction to ensure smooth email communication.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-490cb44 elementor-widget elementor-widget-text-editor\" data-id=\"490cb44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This technology represents a fundamental element of the modern email messaging system. The SMTP server ensures the reliability, security, and efficiency of email transmission. Whether you are an individual user or a business, understanding and correctly using this type of server will significantly improve all your email communications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3d02e4a elementor-widget elementor-widget-text-editor\" data-id=\"3d02e4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 data-start=\"1620\" data-end=\"1663\">Why use a dedicated server?<\/h2><p data-start=\"1665\" data-end=\"1916\">Si vous envoyez r\u00e9guli\u00e8rement des <strong data-start=\"1699\" data-end=\"1725\">emails transactionnels<\/strong> (confirmation de commande, r\u00e9initialisation de mot de passe, notifications automatiques) ou des <strong data-start=\"1822\" data-end=\"1845\">marketing campaigns<\/strong>, il faut configurer un serveur SMTP, l\u2019utilisation d\u2019un relais d\u00e9di\u00e9 pr\u00e9sente de nombreux avantages :<\/p><h3 data-start=\"1918\" data-end=\"1952\">1. <strong data-start=\"1925\" data-end=\"1952\">Meilleure d\u00e9livrabilit\u00e9<\/strong><\/h3><p data-start=\"1953\" data-end=\"2236\">Ce serveur professionnel est configur\u00e9 pour maximiser la\u00a0<a href=\"https:\/\/www.efidem.com\/en\/email-delivery\/\" target=\"_blank\" rel=\"noopener\">deliverability<\/a>, les chances que vos emails atteignent la bo\u00eete de r\u00e9ception. Il est reconnu comme source fiable par les FAI, notamment gr\u00e2ce \u00e0 l\u2019authentification (DKIM, SPF, DMARC), aux adresses IP propres, et aux taux de plainte surveill\u00e9s.<\/p><h3 data-start=\"2238\" data-end=\"2268\">2. <strong data-start=\"2245\" data-end=\"2268\">Gestion des volumes<\/strong><\/h3><p data-start=\"2269\" data-end=\"2480\">Ces serveurs sont con\u00e7us pour traiter un grand volume d\u2019emails en parall\u00e8le, sans ralentissement. Que vous envoyiez 500 ou 50 000 messages, le relais g\u00e8re l\u2019acheminement efficacement et en toute transparence tout comme une\u00a0<a href=\"https:\/\/www.efidem.com\/en\/powerful-french-emailing-software\/api-email-pro\/\" target=\"_blank\" rel=\"noopener\">API email<\/a>.\u00a0<\/p><h3 data-start=\"2482\" data-end=\"2524\">3. <strong data-start=\"2489\" data-end=\"2524\">Suivi et rapports email en temps r\u00e9el<\/strong><\/h3><p data-start=\"2525\" data-end=\"2710\">Vous pouvez suivre les performances de vos envois : taux de livraison, ouvertures, erreurs, bounces\u2026 Ces donn\u00e9es sont pr\u00e9cieuses pour ajuster votre strat\u00e9gie, \u00e9viter les\u00a0<a href=\"https:\/\/www.efidem.com\/en\/smtp-email-common-errors-codes-meanings\/\" target=\"_blank\" rel=\"noopener\">erreurs<\/a>\u00a0de configuration SMTP et am\u00e9liorer vos r\u00e9sultats.<\/p><h3 data-start=\"2712\" data-end=\"2747\">4. <strong data-start=\"2719\" data-end=\"2747\">Simplicit\u00e9 d\u2019int\u00e9gration<\/strong><\/h3><p data-start=\"2748\" data-end=\"2959\">Il s\u2019int\u00e8gre facilement \u00e0 n\u2019importe quel logiciel de messagerie ou application web. Il vous suffit g\u00e9n\u00e9ralement de modifier les param\u00e8tres SMTP (h\u00f4te, port, identifiants) pour commencer \u00e0 l\u2019utiliser.<\/p><h2 data-start=\"2966\" data-end=\"2995\">Comment se passe le service SMTP ?<\/h2><p data-start=\"2997\" data-end=\"3222\">At <strong data-start=\"3002\" data-end=\"3012\">Efidem<\/strong>, nous proposons ce\u00a0<a href=\"https:\/\/www.efidem.com\/en\/emailing-software\/relais-smtp-email-delivrabilite\/\"><strong data-start=\"3032\" data-end=\"3072\">service professionnel<\/strong><\/a>, tester un serveur SMTP con\u00e7u pour les entreprises qui ont besoin d\u2019un envoi d\u2019emails fiable, s\u00e9curis\u00e9 et conforme aux meilleures pratiques. Notre infrastructure garantit :<\/p><ul data-start=\"3223\" data-end=\"3505\"><li data-start=\"3223\" data-end=\"3311\"><p data-start=\"3225\" data-end=\"3311\">A <strong data-start=\"3229\" data-end=\"3252\">haute d\u00e9livrabilit\u00e9<\/strong> sur les principales messageries (Gmail, Outlook, Orange\u2026),<\/p><\/li><li data-start=\"3223\" data-end=\"3311\"><p data-start=\"3225\" data-end=\"3311\">La protection de l&rsquo;adresse du serveur SMTP<\/p><\/li><li data-start=\"3312\" data-end=\"3374\"><p data-start=\"3314\" data-end=\"3374\">A <strong data-start=\"3318\" data-end=\"3340\">s\u00e9curit\u00e9 renforc\u00e9e<\/strong> avec support de DKIM, SPF et TLS,<\/p><\/li><li data-start=\"3375\" data-end=\"3429\"><p data-start=\"3377\" data-end=\"3429\">A <strong data-start=\"3380\" data-end=\"3409\">support technique serveur smtp r\u00e9actif<\/strong> en cas de probl\u00e8me,<\/p><\/li><li data-start=\"3430\" data-end=\"3505\"><p data-start=\"3432\" data-end=\"3505\">From <strong data-start=\"3436\" data-end=\"3463\">statistiques d\u00e9taill\u00e9es<\/strong> pour suivre la performance de vos envois sur\u00a0<a href=\"https:\/\/www.efidem.com\/en\/easy-emailing-platform-snapshoot\/\" target=\"_blank\" rel=\"noopener\">Snapshoot<\/a>,<\/p><\/li><li data-start=\"3430\" data-end=\"3505\"><p data-start=\"3432\" data-end=\"3505\">Pour plus d&rsquo;informations, vous pouvez consulter nos\u00a0<a href=\"https:\/\/www.efidem.com\/en\/documentation\/\" target=\"_blank\" rel=\"noopener\">documentation<\/a>\u00a0SMTP server<\/p><\/li><li data-start=\"3430\" data-end=\"3505\"><p data-start=\"3432\" data-end=\"3505\">Et, pour toutes questions d&rsquo;int\u00e9gration contactez\u00a0<a href=\"https:\/\/support.efidem.com\/support\/home\" target=\"_blank\" rel=\"noopener nofollow\">l&rsquo;\u00e9quipe support<\/a>\u00a0\u00a0<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-15c90b2 e-flex e-con-boxed e-con e-parent\" data-id=\"15c90b2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a1898f2 elementor-widget elementor-widget-image\" data-id=\"a1898f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"451\" height=\"180\" src=\"https:\/\/www.efidem.com\/wp-content\/uploads\/2025\/11\/OIP.webp\" class=\"attachment-large size-large wp-image-17021\" alt=\"sch\u00e9ma relais SMTP d\u00e9di\u00e9 pour am\u00e9liorer la d\u00e9livrabilit\u00e9 des emails\" srcset=\"https:\/\/www.efidem.com\/wp-content\/uploads\/2025\/11\/OIP.webp 451w, https:\/\/www.efidem.com\/wp-content\/uploads\/2025\/11\/OIP-300x120.webp 300w, https:\/\/www.efidem.com\/wp-content\/uploads\/2025\/11\/OIP-18x7.webp 18w\" sizes=\"(max-width: 451px) 100vw, 451px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0785301 elementor-widget elementor-widget-image\" data-id=\"0785301\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_-1024x576.png\" class=\"attachment-large size-large wp-image-10730\" alt=\"Serveur SMTP\" srcset=\"https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_-1024x576.png 1024w, https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_-300x169.png 300w, https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_-768x432.png 768w, https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_-1536x864.png 1536w, https:\/\/www.efidem.com\/wp-content\/uploads\/2020\/03\/API-SMTP-EMAIL-SMS_.png 1920w\" sizes=\"(max-width: 800px) 100vw, 800px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction au serveur SMTP Qu&rsquo;est-ce que le serveur SMTP et \u00e0 quoi sert il ? Un serveur SMTP est un composant cl\u00e9 dans le processus d\u2019envoi des emails. Concr\u00e8tement, c\u2019est un serveur qui prend en charge l\u2019acheminement de vos messages vers les serveurs de messagerie des destinataires. Plut\u00f4t que d\u2019envoyer directement un email de votre [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[46,85],"tags":[],"class_list":["post-12092","post","type-post","status-publish","format-standard","hentry","category-email-marketing","category-relais-smtp"],"acf":[],"modified_by":"@Efidem_csm","amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/posts\/12092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/comments?post=12092"}],"version-history":[{"count":75,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/posts\/12092\/revisions"}],"predecessor-version":[{"id":18253,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/posts\/12092\/revisions\/18253"}],"wp:attachment":[{"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/media?parent=12092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/categories?post=12092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/tags?post=12092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}