{"id":20616,"date":"2026-05-14T17:51:00","date_gmt":"2026-05-14T17:51:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/difference-entre-smtp-et-api\/"},"modified":"2026-09-15T16:27:55","modified_gmt":"2026-09-15T16:27:55","slug":"difference-entre-smtp-et-api","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/fr\/blog\/email\/difference-entre-smtp-et-api\/","title":{"rendered":"SMTP et API\u00a0: leurs diff\u00e9rences et comment les utiliser"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">You\u2019re tasked with integrating email into the app you\u2019re building or the customer relationship management (CRM) tool your business uses. You have two options: traditional SMTP or an SMTP API, which uses HTTP requests (often RESTful and JSON formatted) for faster and more flexible email sending and management. Both are crucial to your email development and deployment process, whether you\u2019re sending an email marketing campaign or a triggered transactional email. But what are they, and when do you use each?<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-1452\"><p class=\"h5 m-0\" id=\"toc-title-1452\">Table des mati\u00e8res<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-smtp\">What is SMTP?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-is-smtp-used\">How is SMTP used?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-are-some-pros-and-cons-of-using-smtp-to-send-emails\">What are some pros and cons of using SMTP to send emails?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-email-api\">What is email API?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-is-an-email-api-used\">How is an email API used?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">06<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-are-some-pros-and-cons-of-using-an-email-api\">What are some pros and cons of using an email API?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">07<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#smtp-vs-api-at-a-glance\">SMTP vs. API at a glance<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">08<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#when-should-you-use-smtp-v-api\">When should you use SMTP v. API?<\/a><a class=\"scrollme link-body-color\" href=\"#when-should-i-use-smtp-for-email\">When should I use SMTP for email?<\/a><a class=\"scrollme link-body-color\" href=\"#when-should-i-use-an-api-for-email\">When should I use an API for email?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">09<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-do-i-get-started-with-an-email-api\">How do I get started with an email API?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">10<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#smtp-vs-api-faqs\">SMTP vs. API: FAQs<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is SMTP?<\/h2>\n\n<p class=\"wp-block-paragraph\">We\u2019re diving right in and tackling <a href=\"https:\/\/www.mailgun.com\/fr\/fonctionnalites\/serveur-smtp\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SMTP<\/a> first. What is it, and how do you use it?<\/p>\n\n<p class=\"wp-block-paragraph\"><b>SMTP stands for Simple Mail Transfer Protocol, and it\u2019s the method of sending emails across the internet.<\/b> An SMTP server lets you use SMTP to transfer mail through a server and across a network to its destination. Unlike most computer servers that handle multiple processes at any given time, an SMTP server is only used to send, receive, and transfer email. Mailgun acts as an intermediary to send mail via SMTP, as shown below:<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4223\" width=\"1500\" height=\"377\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/SMTP_Flowchart.png\" alt=\"SMTP flowchart\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/SMTP_Flowchart.png 1500w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/SMTP_Flowchart-300x75.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/SMTP_Flowchart-768x193.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/SMTP_Flowchart-1024x257.png 1024w\" sizes=\"(max-width: 1500px) 100vw, 1500px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">How is SMTP used?<\/h2>\n\n<p class=\"wp-block-paragraph\">SMTP is designed specifically for one job \u2013 sending emails. It handles the transfer of messages from the sender\u2019s server to the recipient\u2019s server, ensuring reliable delivery.<\/p>\n\n<p class=\"wp-block-paragraph\">When sending via SMTP, you may wonder <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/quel-port-smtp-comprendre-les-ports-25-465-587\/\" target=\"_tabs\" rel=\"noopener noreferrer\">which SMTP port to choose<\/a>. Port 587 is considered the default SMTP port for mail transfer. You should use it, unless your network or provider blocks you.<\/p>\n\n<h2 class=\"wp-block-heading\">What are some pros and cons of using SMTP to send emails?<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that you know the basics of SMTP, let\u2019s go over some advantages and disadvantages of using SMTP to send emails.<\/p>\n\n<p class=\"wp-block-paragraph\">Here are three disadvantages to using SMTP:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Slow performance for large volumes of email: <\/b>SMTP relay requires a lot of back and forth between the sending email client and the receiving server to perform various checks and authentications. This means delays and slow performance, especially when you\u2019re sending large volumes of emails.<\/li>\n\n\n\n<li><b>Changing deliverability of emails:<\/b> Most SMTP relay services use <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/deliverability\/adresses-ip-dediees-et-partagees-laquelle-choisir\/\" target=\"_tabs\" rel=\"noopener noreferrer\">shared IP addresses<\/a>, which affect your sender reputation. This means you won\u2019t experience a consistent sender reputation or consistent deliverability. In turn, this affects the effectiveness of your email campaign and puts a severe dent in key marketing metrics like open rates, conversion rates, and click-through rates. To fix this, you\u2019ll need to implement major <a href=\"https:\/\/help.mailgun.com\/hc\/en-us\/articles\/360011565514-How-Do-I-Verify-My-Domain-and-Other-DNS-Questions\" target=\"_tabs\" rel=\"noopener noreferrer\">Domain Name Service (DNS) adjustments<\/a>.<\/li>\n\n\n\n<li><b>Possible blockage of Port 25: <\/b>While Port 587 is the recommended default for SMTP mail transfer, some email clients and ISPs block Port 25 due to its frequent abuse by spammers. Using Port 25 for SMTP increases the risk of delays or your emails being flagged as spam \u2013 stick with Port 587 instead.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">But SMTP isn\u2019t all drawbacks. Here are three key advantages of using SMTP relays to send emails:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Easy platform migration: <\/b>Because SMTP relays are platform-independent, moving them between systems is simple. This flexibility helps \u201cfuture-proof\u201d your email workflow.<\/li>\n\n\n\n<li><b>Easy to set up: <\/b>SMTP relays are much easier to set up than email APIs. In fact, most email service providers (ESPs) set up SMTP relays and SMTP servers.<\/li>\n\n\n\n<li><b>Simpler to troubleshoot: <\/b>Due to the back-and-forth nature of an SMTP relay, you\u2019ll get a response code every step of the way. This makes troubleshooting much easier than for email APIs.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">What is email API?<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that we know about SMTP, let\u2019s dive into the basics of API. When used for email, email <a href=\"https:\/\/www.mailgun.com\/fr\/fonctionnalites\/email-api\/\" target=\"_blank\" rel=\"noreferrer noopener\">APIs<\/a> are similar to SMTP in sending messages, but they provide more flexible, comprehensive integration options beyond just routing emails through SMTP. This allows APIs to enable automated, triggered email actions and additional features not typically available with SMTP.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>API stands for Application Programming Interface, and, unlike SMTP, it\u2019s used for more than just email. API is software that enables multiple applications and systems to communicate, usually through the Hypertext Transfer Protocol (HTTP).<\/b> For example, when you login to an online account, an HTTP API tells the account\u2019s system that you\u2019re trying to login and then tells you if the login attempt was successful.<\/p>\n\n<p class=\"wp-block-paragraph\">It can be used for many applications, but we use it for email. If you send a message in a Mailgun emailing context, you\u2019re using a web API to generate, queue, and send your message.<\/p>\n\n<h2 class=\"wp-block-heading\">How is an email API used?<\/h2>\n\n<p class=\"wp-block-paragraph\">While an API is used for lots of different applications and actions, we\u2019ll focus on email APIs. <b><a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/quand-utiliser-email-api\/\">With email APIs<\/a>, a given application, like a product website, can use the API to automatically send transactional mail (like receipts and confirmations) without having to queue and send each individually.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">When a product website uses Mailgun, it embeds code into applications like signup forms or checkout pages. When a triggered action occurs, the code sends an API request to Mailgun, instructing it to generate and deliver the correct email to the intended recipient using the website\u2019s data, such as an email list.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4225\" width=\"1190\" height=\"594\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-Integration.png\" alt=\"Mailgun API code\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-Integration.png 1190w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-Integration-300x150.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-Integration-768x383.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-Integration-1024x511.png 1024w\" sizes=\"(max-width: 1190px) 100vw, 1190px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">All email APIs work similarly to this example. Their purpose is to provide fast, consistent email capabilities without the hassle of using a separate provider or software. To facilitate ease of use, Mailgun\u2019s RESTful API allows developers to use their coding language of choice rather than dealing with the headache of finding a provider that uses their specific language to facilitate ease of use.<\/p>\n\n<h2 class=\"wp-block-heading\">What are some pros and cons of using an email API?<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that you know the basics of API, let\u2019s go over some advantages and disadvantages of using API to send emails.<\/p>\n\n<p class=\"wp-block-paragraph\">Here are three disadvantages to using an email API:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Steep learning curve:<\/b> Each email API is unique and has a learning curve before you can perfectly integrate it into your app.<\/li>\n\n\n\n<li><b>Third-party intermediaries: <\/b>Each email API is managed by external ESPs like Mailgun, so you need to trust the provider to handle your email reliably and securely.<\/li>\n\n\n\n<li><b>Need coding knowledge to troubleshoot<\/b>: While SMTP provides you with response codes every step of the way, email APIs require coding knowledge to properly troubleshoot.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">That being said, here are some advantages to using an email API:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Reduces complexity in your app: <\/b>That\u2019s right. Since email APIs are provided by third-party intermediaries, you\u2019re not responsible for their maintenance or building. Instead, you simply need to integrate it into your app.<\/li>\n\n\n\n<li><b>Removes load from your servers: <\/b>Since ESPs provide email APIs as a service, the email-sending load defaults to their servers instead of yours. This increases your email deliverability and decreases send times.<\/li>\n\n\n\n<li><b>Get analytics on your email sending: <\/b>Most ESPs enable you to easily collect analytics on your email practices, including open rates, click-to-open ratio, and click-through rates.<\/li>\n\n\n\n<li><strong>Advanced features:<\/strong> APIs provide the flexibility to manage large attachments seamlessly, which is particularly beneficial for businesses sending detailed reports or multimedia content.\u00a0<\/li>\n\n\n\n<li><strong>Real-time analytics and feedback:<\/strong> Users can monitor open rates, click-through rates, and other engagement metrics in real-time, enabling immediate optimization of email campaigns.\u00a0<\/li>\n\n\n\n<li><strong>Reduced likelihood of email blocking:<\/strong> APIs use authenticated connections and adhere to best practices that reduce the chances of emails being marked as spam or blocked altogether.\u00a0<\/li>\n\n\n\n<li><strong>Security enhancements with Web API: <\/strong>API keys ensure that only authorized applications can send emails, reducing the risk of unauthorized usage and enhancing overall security.\u00a0<\/li>\n\n\n\n<li><strong>Latency reduction for international users:<\/strong> By minimizing the back-and-forth communication required in SMTP, APIs ensure faster email delivery times for international recipients.\u00a0<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">SMTP vs. API at a glance<\/h2>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Feature \/ Factor<\/strong><strong><\/strong>\u00a0<\/td><td><strong>SMTP<\/strong><strong><\/strong>\u00a0<\/td><td><strong>Email API<\/strong><strong><\/strong>\u00a0<\/td><\/tr><tr><td><strong>Ease of setup<\/strong><strong><\/strong>\u00a0<\/td><td>\u2705 Easier to set up, often preconfigured by ESPs\u00a0<\/td><td>\u274c Requires coding knowledge and integration effort\u00a0<\/td><\/tr><tr><td><strong>Migration<\/strong><strong><\/strong>\u00a0<\/td><td>\u2705 Platform-independent, easy to migrate\u00a0<\/td><td>\u274c Migration may require app adjustments\u00a0<\/td><\/tr><tr><td><strong>Troubleshooting<\/strong><strong><\/strong>\u00a0<\/td><td>\u2705 Response codes make troubleshooting straightforward\u00a0<\/td><td>\u274c Requires coding skills to troubleshoot issues\u00a0<\/td><\/tr><tr><td><strong>Performance (high volume emails)<\/strong><strong><\/strong>\u00a0<\/td><td>\u274c Slower due to multiple server checks\u00a0<\/td><td>\u2705 Faster, optimized for bulk sending\u00a0<\/td><\/tr><tr><td><strong>Deliverability consistency<\/strong><strong><\/strong>\u00a0<\/td><td>\u274c Shared IPs can affect sender reputation\u00a0<\/td><td>\u2705 Typically consistent, managed by ESP\u00a0<\/td><\/tr><tr><td><strong>Port issues \/ spam risks<\/strong><strong><\/strong>\u00a0<\/td><td>\u274c Port 25 may be blocked or flagged by ISPs\u00a0<\/td><td>\u2705 No port issues; handled via API\u00a0<\/td><\/tr><tr><td><strong>Server load<\/strong><strong><\/strong>\u00a0<\/td><td>\u274c Uses your servers for sending\u00a0<\/td><td>\u2705 Load handled by ESP, improves performance\u00a0<\/td><\/tr><tr><td><strong>Analytics \/ tracking<\/strong><strong><\/strong>\u00a0<\/td><td>\u274c Limited built-in tracking\u00a0<\/td><td>\u2705 Provides detailed email analytics\u00a0<\/td><\/tr><tr><td><strong>Learning curve<\/strong><strong><\/strong>\u00a0<\/td><td>\u2705 Simple and standardized\u00a0<\/td><td>\u274c Steep, each API is unique and requires learning\u00a0<\/td><\/tr><tr><td><strong>Reliability \/ automation<\/strong><strong><\/strong>\u00a0<\/td><td>\u2705 Standardized protocol, widely supported\u00a0<\/td><td>\u2705 Reliable and easy to automate with triggers\u00a0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">When should you use SMTP v. API?<\/h2>\n\n<p class=\"wp-block-paragraph\">SMTP and API may seem similar, but they serve distinct purposes: SMTP uses a series of text-based commands to transfer mail, while an SMTP API offers a faster, more flexible, and developer-friendly interface by utilizing RESTful HTTP requests for smoother and more efficient email delivery.<\/p>\n\n<p class=\"wp-block-paragraph\">SMTP and API both have applicability when it comes to email. However, there\u2019s one that we here at Mailgun recommend over the other. Let\u2019s take a look.<\/p>\n\n<h3 class=\"wp-block-heading\">When should I use SMTP for email?<\/h3>\n\n<p class=\"wp-block-paragraph\">We recommend using SMTP if you\u2019re a sender that can\u2019t add API to your applications. This includes applications specifically developed for you by a third party that can\u2019t integrate with API. Additionally, you may have an older system or sending method that\u2019s using SMTP \u2013 in that case, it may save you time, money, and energy to keep using SMTP instead of migrating to a new ESP. If it\u2019s not worth it, save yourself the trouble.<\/p>\n\n<p class=\"wp-block-paragraph\">As we mentioned, Port 587 is generally what you should use to send emails via SMTP, but <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/quel-port-smtp-comprendre-les-ports-25-465-587\/\" target=\"_tabs\" rel=\"noopener noreferrer\">you may need another port<\/a> if you\u2019re blocked or otherwise have a problem with your network.<\/p>\n\n<p class=\"wp-block-paragraph\">You can use SMTP for transactional or bulk email. The disadvantage of SMTP is it tends to be slower than API \u2013 there\u2019s a lot more \u201ctalking\u201d between servers. This can lead to lower-performing mail sending.<\/p>\n\n<h3 class=\"wp-block-heading\">When should I use an API for email?<\/h3>\n\n<p class=\"wp-block-paragraph\">We recommend using an <a href=\"https:\/\/www.mailgun.com\/fr\/fonctionnalites\/email-api\/\" target=\"_blank\" rel=\"noreferrer noopener\">API for email<\/a> whenever possible, as APIs involve <a href=\"https:\/\/www.mailgun.com\/fr\/fonctionnalites\/email-api\/\" target=\"_blank\" rel=\"noreferrer noopener\">less back-and-forth communication between servers than SMTP relays<\/a>, making them faster and more efficient. Like SMTP, APIs support bulk and transactional emails, but their streamlined process provides greater flexibility and improved performance for sending large volumes.<\/p>\n\n<p class=\"wp-block-paragraph\">For example, if you\u2019re an online shopping retailer, you should provide relevant email receipts, shipping notifications, and other transactional email messages. Of course, you probably don\u2019t have the time or desire to send these emails to your hundreds (or thousands, or millions) of customers individually.<\/p>\n\n<p class=\"wp-block-paragraph\">With an email API, you can leverage various features to automate sending and tie messages to triggered actions. Unlike SMTP, you can easily code an API to do what you want, when you want it. A purchase is made? Email a receipt. A shipping order is placed? Automatically send a tracking number or location updates. This saves you the crazy hassle of manually updating and sending messages, streamlines your service lifecycle, and strengthens your customer relationships.<\/p>\n\n<p class=\"wp-block-paragraph\">Automated confirmations and receipts build customer trust and encourage repeat business. Any message that reduces friction in the customer journey is valuable, and an email API makes it easy to deliver these communications reliably and efficiently.<\/p>\n\n<h2 class=\"wp-block-heading\">How do I get started with an email API?<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that you know a little more about SMTP vs. API, go forth and email with confidence. You\u2019ll know what method is right for you, and you\u2019ll have two less acronyms to worry about. Interested in more explanatory articles like this? Check out our thoughts on <a href=\"https:\/\/www.mailgun.com\/blog\/it-and-engineering\/how-use-parallel-programming\/\" target=\"_tabs\" rel=\"noopener noreferrer\">parallel programming<\/a>, <a href=\"https:\/\/www.mailgun.com\/blog\/product\/gmail-open-tracking-test-at-mailgun\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Gmail open tracking<\/a>, and <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/simplifier-le-concept-complexe-du-rendu-des-emails\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email rendering<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">If you\u2019re ready to start sending, <a href=\"https:\/\/www.mailgun.com\/fr\/\" target=\"_tabs\" rel=\"noopener noreferrer\">check out our powerful email API<\/a> and see how we can supercharge your email campaigns today.<\/p>\n\n<h2 class=\"wp-block-heading\">SMTP vs. API: FAQs<\/h2>\n    <div data-content-type=\"longform\" id=\"accordion-id-block_4c268321d5d11c85e8778564f7a52c84\" class=\"accordion accordion-longform d-flex flex-column gap-3 my-3\">\r\n\r\n        <div class=\"acf-innerblocks-container\">\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_85318ba9006d4d9c57a5d361e779384e_8892\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_85318ba9006d4d9c57a5d361e779384e_8892\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_85318ba9006d4d9c57a5d361e779384e_8892\">\r\n            How do I authenticate SMTP or API requests using SPF, DKIM, and DMARC best practices?         <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_85318ba9006d4d9c57a5d361e779384e_8892\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_85318ba9006d4d9c57a5d361e779384e_8892\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Authentication for email isn\u2019t tied to the protocol (SMTP vs. API) as much as it is to your sending domain. Regardless of how you send, you\u2019ll want to:\u00a0<\/p>\n\n\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li><strong>SPF:<\/strong> Add a DNS TXT record that authorizes your email service provider (ESP) to send on your behalf. For Mailgun, that means including the Mailgun mechanism in your SPF record.\u00a0<\/li>\n\n\n\n<li><strong>DKIM:<\/strong> Publish a public key in your DNS and let your ESP sign outgoing messages with the private key. This ensures the messages can\u2019t be altered in transit.\u00a0<\/li>\n\n\n\n<li><strong>DMARC:<\/strong> Set up a DMARC policy in DNS to instruct inbox providers how to handle messages that fail SPF or DKIM checks. Start with \u201c<code>p=none<\/code>\u201d to monitor, then move to \u201c<code>quarantine<\/code>\u201d or \u201c<code>reject<\/code>\u201d once you\u2019re confident.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These records live in your domain\u2019s DNS regardless of whether you send via SMTP or API. Once they\u2019re in place, Mailgun (or another ESP) automatically applies them to outbound mail.\u00a0<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_469180e9d77d266601d5786094da0cec_6331\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_469180e9d77d266601d5786094da0cec_6331\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_469180e9d77d266601d5786094da0cec_6331\">\r\n            Can you provide code examples of sending email via a RESTful SMTP API in common languages?         <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_469180e9d77d266601d5786094da0cec_6331\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_469180e9d77d266601d5786094da0cec_6331\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Strictly speaking, SMTP itself isn\u2019t RESTful; it\u2019s a protocol. But many email providers \u2013 including Mailgun \u2013 expose a RESTful <strong>email API<\/strong> that developers can call instead of using SMTP.\u00a0<\/p>\n\n\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li><strong>Python:<\/strong> <a href=\"https:\/\/www.mailgun.com\/blog\/it-and-engineering\/send-email-using-python\/\" target=\"_blank\" rel=\"noreferrer noopener\">This blog post<\/a> walks through using Mailgun\u2019s REST API with the requests library.\u00a0<\/li>\n\n\n\n<li><strong>Node.js:<\/strong> <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/comment-envoyer-email-transactionnel-application-nodejs-api-mailgun\/\" target=\"_blank\" rel=\"noreferrer noopener\">This blog post<\/a> covers a working sample using the official SDK.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you must use SMTP, most languages support it through built-in libraries (<code>smtplib<\/code> for Python, <code>nodemailer<\/code> for Node.js). The main difference is you\u2019ll connect to an SMTP host\/port and pass credentials instead of hitting an HTTP endpoint.\u00a0<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_dbcbcc9e2aefb17af81848cc9d9ef769_9302\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_dbcbcc9e2aefb17af81848cc9d9ef769_9302\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_dbcbcc9e2aefb17af81848cc9d9ef769_9302\">\r\n            What monitoring and debugging tools exist for SMTP APIs to track deliverability issues?         <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_dbcbcc9e2aefb17af81848cc9d9ef769_9302\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_dbcbcc9e2aefb17af81848cc9d9ef769_9302\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Look for these features (Mailgun and other top ESPs provide them):\u00a0<\/p>\n\n\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li><strong>Delivery logs &amp; dashboards:<\/strong> Real-time logs of accepted, delivered, failed, or delayed messages.\u00a0<\/li>\n\n\n\n<li><strong>Webhook alerts:<\/strong> Push notifications when bounces, complaints, or failures occur.\u00a0<\/li>\n\n\n\n<li><strong>Response codes:<\/strong> SMTP gives you codes at each step of the handshake. APIs often provide JSON status objects.\u00a0<\/li>\n\n\n\n<li><strong>Inbox placement tests:<\/strong> Some providers integrate with seed-list testing tools to see where your email lands.\u00a0<\/li>\n\n\n\n<li><strong>Reputation monitoring:<\/strong> Many ESPs surface your sending IP\/domain reputation inside the dashboard.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Combining these helps you spot problems quickly \u2013 whether that\u2019s a blocked port, a failing DKIM signature, or a content issue triggering spam filters.\u00a0<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_585a21f5eaa667648a9ea26288d60c83_5252\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_585a21f5eaa667648a9ea26288d60c83_5252\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_585a21f5eaa667648a9ea26288d60c83_5252\">\r\n            How do pricing and rate limits compare across major SMTP API providers?         <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_585a21f5eaa667648a9ea26288d60c83_5252\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_585a21f5eaa667648a9ea26288d60c83_5252\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Pricing and throughput differ by vendor but you\u2019ll typically see:\u00a0<\/p>\n\n\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li><strong>SMTP relay:<\/strong> Often included \u201cfree\u201d with hosting or ESP plans but slower, with implicit limits (connections per second, per-message size).\u00a0<\/li>\n\n\n\n<li><strong>Email APIs:<\/strong> Usually priced per 1,000 emails sent, with higher tiers unlocking faster send rates and dedicated IPs. APIs tend to support higher concurrency than SMTP because they\u2019re stateless HTTP calls rather than open socket connections.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For example, Mailgun\u2019s entry tiers give you thousands of API calls per month with defined rate limits; higher-volume plans provide dedicated infrastructure and priority sending. Always check your provider\u2019s published send-rate limits to avoid throttling.\u00a0<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_eadd5ddeefde7f37d71eabdc46237a1d_8825\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_eadd5ddeefde7f37d71eabdc46237a1d_8825\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_eadd5ddeefde7f37d71eabdc46237a1d_8825\">\r\n            What is the migration process and best practices for moving from SMTP relay to an email API?         <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_eadd5ddeefde7f37d71eabdc46237a1d_8825\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_eadd5ddeefde7f37d71eabdc46237a1d_8825\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Migrating is usually straightforward if you plan it out:\u00a0<\/p>\n\n\n\n<ol style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30);list-style-type:a\" class=\"wp-block-list\">\n<li><strong>Audit your current SMTP usage:<\/strong> List every app, cron job, or integration that sends mail.\u00a0<\/li>\n\n\n\n<li><strong>Set up your API credentials &amp; DNS records:<\/strong> Make sure SPF, DKIM, and DMARC are configured for your domain before cutover.\u00a0<\/li>\n\n\n\n<li><strong>Implement the API in a staging environment:<\/strong> Start with triggered or low-volume sends.\u00a0<\/li>\n\n\n\n<li><strong>Monitor analytics &amp; deliverability:<\/strong> Compare bounce\/complaint rates between SMTP and API to confirm the new setup.\u00a0<\/li>\n\n\n\n<li><strong>Gradual switchover:<\/strong> Migrate transactional mail first (password resets, receipts), then bulk\/marketing messages once stable.\u00a0<\/li>\n\n\n\n<li><strong>Retire old SMTP credentials:<\/strong> Rotate or revoke SMTP passwords to prevent accidental use once the API is live.\u00a0<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This phased approach minimizes downtime and lets you take advantage of faster sending, better analytics, and more flexibility as soon as possible.\u00a0<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n<\/div>\r\n\r\n\r\n\r\n\r\n    <\/div>\r\n\r\n    \r\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_80bfbedb9de4727051197d223044fa23\">\r\n                    <p class=\"text-uppercase section-caption text-body-color\">\r\n                Sign Up            <\/p>\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_80bfbedb9de4727051197d223044fa23\">\r\n                It&rsquo;s easy to get started. And it&rsquo;s free.            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">See what you can accomplish with the world\u2019s best email delivery platform.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/signup.mailgun.com\/new\/signup\"  class=\"btn btn-secondary\" >Get started<\/a><\/div>\r\n    <\/aside>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>Nous vous comprenons. En mati\u00e8re d&#8217;email, certains termes ressemblent parfois \u00e0 du charabia. C&rsquo;est particuli\u00e8rement vrai pour les acronymes SMTP et API. Il peut \u00eatre difficile de s&rsquo;y retrouver parmi ces termes, et encore plus de savoir quand les utiliser. Mais ne vous inqui\u00e9tez pas, nous sommes l\u00e0 pour vous aider. Dans cet article, nous vous expliquons les diff\u00e9rences entre SMTP et API, et dans quel cas utiliser l&rsquo;un ou l&rsquo;autre.<\/p>\n","protected":false},"author":27,"featured_media":4074,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[20],"class_list":["post-20616","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SMTP ou API\u00a0: choisir le bon outil d&#039;envoi d&#039;emails - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez les principales diff\u00e9rences entre SMTP et API pour vos besoins en mati\u00e8re d&#039;emails. 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