{"id":13003,"date":"2026-03-13T20:16:40","date_gmt":"2026-03-13T20:16:40","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/rebonds-d-emails-dans-la-bounce-house\/"},"modified":"2026-03-14T03:28:20","modified_gmt":"2026-03-14T03:28:20","slug":"rebonds-d-emails-dans-la-bounce-house","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/fr\/blog\/deliverability\/rebonds-d-emails-dans-la-bounce-house\/","title":{"rendered":"On se l\u00e2che sur les rebonds d&#8217;emails"},"content":{"rendered":"\n<p><br \/>\u00a0<\/p>\n\n<p>This week, the Bounce House is going meta and talking about all things email bounce.<\/p>\n\n<p>Bouncing sounds like fun, until you fall on your as&#8230; <br \/>I mean, trampolines are bouncy, but deceptively dangerous. Leprechauns\u00a0are bouncy, but\u00a0they\u2019re\u00a0tricksters. Email bounce logs\u00a0are bouncy, but\u00a0they\u2019re\u00a0also misleading.\u00a0<\/p>\n\n<p>Every email expert in existence teaches the same neat little rule:\u00a0<\/p>\n\n<p><strong>4xx = soft bounce (temporary, retry!)<\/strong>\u00a0<strong>5xx = hard bounce (permanent, delete!)<\/strong>\u00a0<\/p>\n\n<p>And I will admit that is\u00a0<em>broadly<\/em>\u00a0true. In the same way \u201cgreen means go\u201d is true, but you still wait for oncoming traffic to clear the intersection before you hit the gas.\u00a0<\/p>\n\n<p>Here&rsquo;s what most glossaries skip over:<br \/><strong>Bounce codes are signals. Treating them as law will get you sideswiped.<\/strong>\u00a0<\/p>\n\n<p>They&rsquo;re strategic, they&rsquo;re contextual, and they are absolutely not applied consistently across mailbox providers, private servers, or even time and space.\u00a0<\/p>\n\n<p>There is no global bounce tribunal. The Inbox Supreme Court won\u2019t say a bounce rule is unjust. No international bounce standards enforcement squad will be pulling mailbox providers over like:\u00a0<\/p>\n\n<p><em>\u00ab\u00a0Excuse me, Gmail, you used a 4xx for something that feels pretty 5xx-ish. We\u2019re gonna need to see some ID.\u00a0\u00bb<\/em>\u00a0<\/p>\n\n<p>Mailbox providers return whatever response best protects their users, not optimizing for your ROI. Which means if you\u2019re treating bounces like a flowchart instead of a conversation, it\u2019s time to spring forward.\u00a0<\/p>\n\n<p>It\u2019s 2026, and we\u2019re moving past binary bounce logic.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>The <\/strong>bounce myth that&rsquo;s making you overreact <\/h2>\n\n<p>Senders love a hard and fast rule of thumb, like:\u00a0<\/p>\n\n<p>\u2705 4xx = \u00ab\u00a0It&rsquo;s fine, just retry!\u00a0\u00bb\u00a0\u00a0<\/p>\n\n<p>\u274c 5xx = \u00ab\u00a0It&rsquo;s dead, suppress forever!\u00a0\u00bb\u00a0<\/p>\n\n<p>But delivereality (I just coined that one, you\u2019re welcome) is messier:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Some 4xx failures will never succeed, no matter how often you retry.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Some 5xx failures will resolve later when conditions change.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The same code can mean different things at different providers.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Providers can change how they use codes or introduce new ones without notice.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Sometimes they get it wrong, and probably won\u2019t admit it.\u00a0<\/li>\n<\/ul>\n\n<p>They optimize for user safety, not your reporting clarity. Mailbox providers can label a failure however they want, and it\u2019s up to us to interpret what actually happened.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Why bounce interpretation is hard (and not your fault)<\/strong>\u00a0<\/h2>\n\n<p><strong>1) SMTP gives providers suggested verbiage, not ironclad templates<\/strong>\u00a0<\/p>\n\n<p>SMTP basically says: \u00ab\u00a0Here&rsquo;s how you format a response.\u201d It does not say: \u00ab\u00a0Here&rsquo;s exactly when you must use each response and what to say.\u00a0\u00bb\u00a0<\/p>\n\n<p>Mailbox providers classify failures based on what\u00a0<em>they<\/em>\u00a0care about, which is primarily:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Abuse prevention\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Resource constraints\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Spam patterns\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>User behavior signals\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Policy changes\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Internal risk scoring\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Their own operational quirks\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>My job security (thank you Microsoft for your continued service)\u00a0<\/li>\n<\/ul>\n\n<p><strong>2) Failures happen at different points in the handshake<\/strong>\u00a0<\/p>\n\n<p>Not all bounces are created equal. \u00ab\u00a0Failed\u00a0\u00bb could mean:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The domain is dead or broken\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The recipient address doesn\u2019t exist\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The server wants to slow you down\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The provider thinks you&rsquo;re sketchy\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Your content triggered a policy block\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>You\u2019re sending like a firehose but you\u2019ve only got a sprinkler\u2019s reputation\u00a0<\/li>\n<\/ul>\n\n<p>And those all get represented as\u2026 a couple of digits and a link, probably to a postmaster page that was last updated in the dialup days.\u00a0<\/p>\n\n<p><strong>3) Some \u00ab\u00a0temporary\u00a0\u00bb failures are permanent in practice<\/strong>\u00a0<\/p>\n\n<p>Classic example: mailbox full.\u00a0<\/p>\n\n<p>Technically temporary. But, practically? That mailbox may have been full since the pandemic (RIP social distancing, we barely knew ye).\u00a0<\/p>\n\n<p>Other \u00ab\u00a04xx but don&rsquo;t kid yourself\u00a0\u00bb scenarios:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Corporate policy blocks that require manual allowlisting (and nobody will do it)\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Greylisting loops your retry pattern never satisfies\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>No MX record\u00a0\u00a0<\/li>\n<\/ul>\n\n<p>Retrying those endlessly is like texting \u201cwyd\u201d to a disconnected number, only worse; in this scenario T-Mobile could just choose to never deliver any of your \u201cu up?\u201ds to anyone, ever again, even if they wanted them and were indeed up.\u00a0<\/p>\n\n<p><strong>4) Sometimes \u00ab\u00a0permanent\u00a0\u00bb doesn\u2019t mean \u201cforever\u201d<\/strong>\u00a0<\/p>\n\n<p>Meanwhile, 5xx can sometimes be situational:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>DNS gets fixed\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>A user reactivates an old account\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>A provider reverses a mistaken policy block\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Authentication changes\u00a0<\/li>\n<\/ul>\n\n<p>If your system treats every 5xx like a dramatic eject button, you&rsquo;ll slowly shrink your reachable audience over time and wonder why engagement and revenue keep dropping. As an imaginary example:\u00a0<a href=\"mailto:buoncehouse@example.com\" target=\"_blank\" rel=\"noreferrer noopener\">buoncehouse@example.com<\/a>\u00a0bounces with \u201cuser unknown\u201d and feels like a slam\u2011dunk permanent failure. It looks like a typo, the mailbox doesn\u2019t exist, case closed. But email addresses are more like apartments than tombstones \u2014 people move in\u00a0<strong>and<\/strong>\u00a0out. Someone could stroll in tomorrow, claim that exact username for whatever reason, and suddenly your \u201cpermanent\u201d failure is a very real human, with a very real spam button, and possibly very real, negative opinions about getting your newsletter.\u00a0<\/p>\n\n<p>Saging the house is good, but don\u2019t Konmari your list into oblivion. Even Marie had regrets.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Deferrals vs. blocks (without the jargon headache)<\/strong>\u00a0<\/h2>\n\n<p>A\u00a0<strong>deferral<\/strong>\u00a0(usually 4xx) means:\u00a0<em>\u00ab\u00a0Not right now.\u00a0\u00bb<\/em>\u00a0<\/p>\n\n<p>Often this shows up for rate limiting, greylisting, temporary system load, or suspicious behavior that hasn&rsquo;t crossed a hard threshold yet.\u00a0<\/p>\n\n<p>A\u00a0<strong>block<\/strong>\u00a0(usually 5xx) means:\u00a0<em>\u00ab\u00a0Not ever.\u00a0\u00bb<\/em>\u00a0<\/p>\n\n<p>These are typically tied to reputation failures, authentication problems, policy violations, or nonexistent recipients.\u00a0<\/p>\n\n<p>But here&rsquo;s where it gets juicy:\u00a0<\/p>\n\n<p>Some providers intentionally use repeated deferrals as a\u00a0<strong>behavior correction tool<\/strong>. Technically they&rsquo;re saying \u00ab\u00a0you can try again later.\u00a0\u00bb Practically, they&rsquo;re saying:\u00a0<em>\u00ab\u00a0Fix your behavior before we let this through. Time heals most wounds, but not this one.\u00a0\u00bb<\/em>\u00a0<\/p>\n\n<p>The first digit tells you classification, but it\u2019s missing context.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Retrying a message vs. trusting an address<\/strong>\u00a0<\/h2>\n\n<p>This is where it gets squishy.\u00a0<\/p>\n\n<p>When a bounce happens, you&rsquo;re actually making\u00a0<strong>two separate decisions<\/strong>:\u00a0<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Should I retry this specific\u00a0<em>message<\/em>?\u00a0<\/li>\n<\/ol>\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Should I trust this\u00a0<em>address<\/em>\u00a0in the future?\u00a0<\/li>\n<\/ol>\n\n<p>Those are not the same thing. A temporary rate limit might mean:\u00a0<em>retry this message later.<\/em>\u00a0It does not automatically mean:\u00a0<em>this address is guaranteed good for delivery in the future.<\/em>\u00a0<\/p>\n\n<p>Similarly, a permanent rejection might mean:\u00a0<em>stop trying this message.<\/em>\u00a0It does not always mean:\u00a0<em>burn this address from your database for eternity.<\/em>\u00a0<\/p>\n\n<p>If you collapse them into one reflexive reaction, you&rsquo;ll either retry toxic addresses indefinitely, or suppress recoverable ones. Mailbox providers expect you to understand your audience, and if you don\u2019t even know which addresses are actually alive, that\u2019s not exactly a positive reputation signal.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Your ESP has bounce logic. You still have responsibility.<\/strong>\u00a0<\/h2>\n\n<p>Every ESP \u2014 including Mailgun \u2014 implements bounce handling. At scale, infinite retries are downright dangerous.\u00a0<\/p>\n\n<p>But suppression strategies vary widely across platforms and philosophies:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Some suppress aggressively after a small number of soft failures\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Some let soft bounces decay indefinitely\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Some retry aggressively\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Some are extremely conservative.\u00a0<\/li>\n<\/ul>\n\n<p>Those are risk calculations and not universal truths. Platform logic protects infrastructure, but your list quality? That\u2019s all you!\u00a0<\/p>\n\n<p>One sender\u2019s typo is another sender\u2019s spam trap.\u00a0<br \/>One sender\u2019s \u201crate limited\u201d is another sender\u2019s reputation spiral.\u00a0<\/p>\n\n<p>The cleaner your acquisition \u2014 especially with confirmed opt-in \u2014 the clearer those signals become.\u00a0<\/p>\n\n<p>Even if your ESP is thoughtful, you should still review your own patterns.\u00a0<\/p>\n\n<p><em>(If you&rsquo;re a Mailgun customer, you can review how we approach bounce handling and suppression in our documentation. If you&rsquo;re using another provider, it&rsquo;s worth asking how they classify and suppress addresses \u2014 and what thresholds trigger suppression, if any.)<\/em>\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>So what should you do next?<\/strong>\u00a0<\/h2>\n\n<p><strong>Triangulate. Don&rsquo;t just automate.<\/strong>\u00a0<\/p>\n\n<p>You don&rsquo;t need the full Encyclopedia Bouncetannica, you just need a better mental model:\u00a0<\/p>\n\n<p>Bounces are evidence, but they\u2019re not the verdict.\u00a0<\/p>\n\n<p>When you see failures, look at:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The full response text (policy? spam? rate limit? authentication?).\u00a0\u00a0\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The provider (consumer MBP vs private infrastructure matters)\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Your recent sending behavior (volume spike? new list? dormant segment reactivation?)\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The pattern over time (isolated vs trend)\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Previous behavior for this recipient (did the confirm opt in? Engage previously? How recently? How many emails have you sent without them interacting?)\u00a0<br \/>\u00a0<br \/>\u00a0<\/li>\n<\/ul>\n\n<p>One bounce is a symptom, but a pattern is a diagnosis.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>The real spring cleaning<\/strong>\u00a0<\/h2>\n\n<p>Chasing delivery without context is like chasing a leprechaun. You can sprint after every \u00ab\u00a0temporary failure\u00a0\u00bb hoping it turns into inbox gold \u2014 and end up lost in the woods, yelling at a rainbow, with your sender reputation in shambles.\u00a0<\/p>\n\n<p>Instead:\u00a0<\/p>\n\n<p>\u2705 Read the whole bounce response, not just the code\u00a0\u00a0<\/p>\n\n<p>\u2705 Watch for patterns across time and providers\u00a0\u00a0<\/p>\n\n<p>\u2705 Audit your sending behavior\u00a0\u00a0<\/p>\n\n<p>\u2705 Separate retry decisions from suppression ones\u00a0<\/p>\n\n<p>\u2705 Look for what\u2019s driving failures, not just for the impact report\u00a0<\/p>\n\n<p>Because the inbox is not obligated to be consistent. But you are.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>TL;DR<\/strong>\u00a0<\/h2>\n\n<ul class=\"wp-block-list\">\n<li>4xx vs. 5xx is a guideline, not a guarantee.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Retry logic and suppression decisions are different \u2014 don&rsquo;t collapse them.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Deferrals can function like blocks when providers use them as behavior correction.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>Some permanent failures resolve. Some temporary failures never will.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>ESP bounce logic is prevention but sending behavior is the cure\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>What\u2019s best for your list is usually triangulation, not blind automation.\u00a0<\/li>\n<\/ul>\n\n<p>Bounce codes aren\u2019t red or green lights; they\u2019re yellow. Like that pot of ROI gold that will be perpetually out of reach if you take bounces at face value.\u00a0<\/p>\n\n<p>March is the perfect time to stop reacting to the number\u00a0and start understanding the message.\u00a0<\/p>\n    <div data-content-type=\"longform\" class=\"longform-spacings\">\r\n        <div class=\"cta bg-primary rounded-lg px-5 py-6 p-md-7 px-md-6\">\r\n                    <div class=\"form-subscription\">\r\n                            <div class=\"h4 mb-3\">\r\n                    Keep me posted! Get great resources in your inbox every week.                <\/div>\r\n                                    <form accept-charset=\"UTF-8\" action=\"\" enctype=\"multipart\/form-data\" data-form-subscription method=\"POST\" style=\"max-width: 400px;\">\r\n                <div class=\"row justify-content-between align-items-top g-2\">\r\n                    <div class=\"col-10\">\r\n                        <input type=\"email\" name=\"email\" class=\"form-control\" placeholder=\"Email\" autocomplete=\"email\" required>\r\n                        <div data-fs=\"error\" role=\"alert\" class=\"invalid-feedback\">\r\n                            Please complete this required field.                        <\/div>\r\n                    <\/div>\r\n                                            <div class=\"col-12 order-last mt-3 fs-xxs\" data-fs=\"acceptance\" style=\"display:none;\">\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-terms-5610\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"terms\">\r\n                                    <label for=\"formSubscriptionAcceptance-terms-5610\" class=\"form-check-label text-body-color\">\r\n                                        J&rsquo;ai lu et j&rsquo;accepte les conditions d&rsquo;utilisation.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-privacy-4699\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"privacy\">\r\n                                    <label for=\"formSubscriptionAcceptance-privacy-4699\" class=\"form-check-label text-body-color\">\r\n                                        J&rsquo;ai lu et j&rsquo;accepte la politique de confidentialit\u00e9.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                                                    <\/div>\r\n                    \r\n                                            <div class=\"col-12 order-last fs-xxs mb-0 mt-2 text-body-color\">\r\n                            Send me the Mailgun newsletter. I expressly agree to receive the newsletter and know that I can easily unsubscribe at any time.                        <\/div>\r\n                    \r\n                    <div class=\"col-2\">\r\n                        <button type=\"submit\" value=\"Submit\" aria-label=\"Submit\" class=\"btn btn-secondary btn-icon\">\r\n                            <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/layout\/chevron-right.svg\"><\/svg>\r\n                        <\/button>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <input type=\"hidden\" name=\"formSubscriptionRecaptchaToken\" data-fs=\"recaptcha-token\">\r\n\r\n            <\/form>\r\n            <div data-fs=\"message-success\" style=\"display: none;\">\r\n                <p class=\"mb-0 mt-2 text-body-color\">\r\n                    Check your inbox monthly for your Mailgun Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 This week, the Bounce House is going meta and talking about all things email bounce. Bouncing sounds like fun, until you fall on your as&#8230; I mean, trampolines are bouncy, but deceptively dangerous. Leprechauns\u00a0are bouncy, but\u00a0they\u2019re\u00a0tricksters. Email bounce logs\u00a0are bouncy, but\u00a0they\u2019re\u00a0also misleading.\u00a0 Every email expert in existence teaches the same neat little rule:\u00a0 4xx [&hellip;]<\/p>\n","protected":false},"author":89,"featured_media":11820,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-13003","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-deliverability"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>On se l\u00e2che sur les rebonds d&#039;emails -<\/title>\n<meta name=\"description\" content=\"This week the Bounce House goes meta and talks about bounces. Not the fun kind. The kind that shrinks your list while you follow the &#039;rules&#039;.\" \/>\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.mailgun.com\/fr\/blog\/deliverability\/rebonds-d-emails-dans-la-bounce-house\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On se l\u00e2che sur les rebonds d&#039;emails -\" \/>\n<meta property=\"og:description\" content=\"This week the Bounce House goes meta and talks about bounces. Not the fun kind. 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