{"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.\" target=\"_blank\" rel=\"noopener\"><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\" target=\"_blank\" rel=\"noopener\">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\" target=\"_blank\" rel=\"noopener\">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\">If you regularly send <strong data-start=\"1699\" data-end=\"1725\">transactional emails<\/strong> (order confirmation, password reset, automatic notifications) or <strong data-start=\"1822\" data-end=\"1845\">marketing campaigns<\/strong>, you need to configure an SMTP server; using a dedicated relay offers numerous advantages:<\/p><h3 data-start=\"1918\" data-end=\"1952\">1. <strong data-start=\"1925\" data-end=\"1952\">Best deliverability<\/strong><\/h3><p data-start=\"1953\" data-end=\"2236\">This professional server is configured to maximize\u00a0<a href=\"https:\/\/www.efidem.com\/en\/email-delivery\/\" target=\"_blank\" rel=\"noopener\">deliverability<\/a>, the chances of your emails reaching the inbox. It is recognized as a reliable source by ISPs, notably thanks to authentication (DKIM, SPF, DMARC), clean IP addresses, and monitored complaint rates.<\/p><h3 data-start=\"2238\" data-end=\"2268\">2. <strong data-start=\"2245\" data-end=\"2268\">Volume Management<\/strong><\/h3><p data-start=\"2269\" data-end=\"2480\">These servers are designed to process a high volume of emails in parallel, without slowdowns. Whether you send 500 or 50,000 messages, the relay handles delivery efficiently and transparently, just like a\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\">Real-time email tracking and reporting<\/strong><\/h3><p data-start=\"2525\" data-end=\"2710\">You can track the performance of your shipments: delivery rates, opens, errors, bounces... This data is valuable for adjusting your strategy, avoiding\u00a0<a href=\"https:\/\/www.efidem.com\/en\/smtp-email-common-errors-codes-meanings\/\" target=\"_blank\" rel=\"noopener\">errors<\/a>\u00a0of SMTP configuration and improve your results.<\/p><h3 data-start=\"2712\" data-end=\"2747\">4. <strong data-start=\"2719\" data-end=\"2747\">Ease of integration<\/strong><\/h3><p data-start=\"2748\" data-end=\"2959\">It integrates easily with any email client or web application. You generally just need to change the SMTP settings (host, port, credentials) to start using it.<\/p><h2 data-start=\"2966\" data-end=\"2995\">How does SMTP service work?<\/h2><p data-start=\"2997\" data-end=\"3222\">At <strong data-start=\"3002\" data-end=\"3012\">Efidem<\/strong>, we propose this\u00a0<a href=\"https:\/\/www.efidem.com\/en\/emailing-software\/relais-smtp-email-delivrabilite\/\"><strong data-start=\"3032\" data-end=\"3072\">professional service<\/strong><\/a>, test an SMTP server designed for businesses that need reliable, secure email sending that complies with best practices. Our infrastructure guarantees:<\/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\">high deliverability<\/strong> on major email services (Gmail, Outlook, Orange... ),<\/p><\/li><li data-start=\"3223\" data-end=\"3311\"><p data-start=\"3225\" data-end=\"3311\">Protecting the SMTP server address<\/p><\/li><li data-start=\"3312\" data-end=\"3374\"><p data-start=\"3314\" data-end=\"3374\">A <strong data-start=\"3318\" data-end=\"3340\">enhanced security<\/strong> with DKIM, SPF, and TLS support,<\/p><\/li><li data-start=\"3375\" data-end=\"3429\"><p data-start=\"3377\" data-end=\"3429\">A <strong data-start=\"3380\" data-end=\"3409\">Responsive SMTP server support<\/strong> in case of a problem,<\/p><\/li><li data-start=\"3430\" data-end=\"3505\"><p data-start=\"3432\" data-end=\"3505\">From <strong data-start=\"3436\" data-end=\"3463\">Detailed statistics<\/strong> to track the performance of your shipments on\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\">For more information, you can consult our\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\">And for all integration questions, contact\u00a0<a href=\"https:\/\/support.efidem.com\/support\/home\" target=\"_blank\" rel=\"noopener\">the support team<\/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=\"Dedicated SMTP relay schema to improve email deliverability\" 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=\"SMTP server\" 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":0,"href":"https:\/\/www.efidem.com\/en\/wp-json\/wp\/v2\/posts\/12092\/revisions"}],"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}]}}