{"id":21208,"date":"2025-07-02T00:00:00","date_gmt":"2025-07-02T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/falha-no-envio-de-e-mail\/"},"modified":"2026-09-15T17:32:26","modified_gmt":"2026-09-15T17:32:26","slug":"falha-no-envio-de-e-mail","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/pt\/blog\/email\/falha-no-envio-de-e-mail\/","title":{"rendered":"Falha no envio do meu e-mail: entendendo a mensagem de erro"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Let\u2019s say you\u2019ve integrated your app with email functionality, designed some great email content, developed a marketing strategy, and you think you\u2019re good to go. But then you hit send from your email client, and you see one of the following error messages from your mail delivery subsystem:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><i>Message not delivered<\/i>.<\/li>\n\n\n\n<li><i>Email failed to send.<\/i><\/li>\n\n\n\n<li><i>Failed to send email.<\/i><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">You\u2019ve probably thought long and hard about\u00a0<a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/soft-bounces-mysteries-failures\/\">emails failing to get delivered<\/a>, but what\u2019s this about emails failing to send? In this article, we discuss some of the\u00a0common causes for\u00a0undelivered emails. Then, we share some ways to fix the issue and leave you with five tips for smoother future email sends.<\/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-9632\"><p class=\"h5 m-0\" id=\"toc-title-9632\">\u00cdndice<\/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-does-the-email-failed-to-send-message-mean\">What does the \u2018Email failed to send\u2019 message mean?<\/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=\"#why-do-emails-fail-to-send-and-how-can-i-fix-it\">Why do emails fail to send, and how can I fix it?<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_1-youre-not-connected-to-the-internet\">1. You\u2019re not connected to the internet<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_2-youve-set-up-your-email-client-with-the-wrong-smtp-parameters\">2. You\u2019ve set up your email client with the wrong SMTP parameters<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_3-your-smtp-server-connection-is-malfunctioning\">3. Your SMTP server connection is malfunctioning<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_4-youre-using-the-wrong-smtp-port\">4. You\u2019re using the wrong SMTP port<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_5-your-firewall-settings-are-getting-in-the-way\">5. Your firewall settings are getting in the way<\/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=\"#anchor_4-tips-to-avoid-the-email-failed-to-send-message\">4 tips to avoid the \u2018email failed to send\u2019 message<\/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-if-my-emails-wont-send-via-api\">What if my emails won\u2019t send via 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=\"#the-importance-of-sender-reputation-in-email-deliverability\">The importance of sender reputation in email deliverability<\/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=\"#wrapping-up\">Wrapping up<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What does the \u2018Email failed to send\u2019 message mean?<\/h2>\n\n<p class=\"wp-block-paragraph\">Simply put, this message is as it says: your email is currently not deliverable. Email delivery failure can feel complicated, but the first place to look is at your SMTP server, the mail server responsible for sending, receiving, and transferring your email via the Simple Mail Transfer Protocol (SMTP) protocol. SMTP then uses TLS\/SSL to secure the network connection between your email client and your mail server.<\/p>\n\n<p class=\"wp-block-paragraph\">Email sending failures often occur if you self-manage your own SMTP server, which comes with large technical overhead and security requirements.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Understanding a bit about the technical journey email takes from outbox to inbox can help solve problems like failure to send and understand why your emails are not going through.<!-- --> Get the breakdown in our post: <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/como-o-e-mail-funciona\/\">How does email work?<\/a><\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">Why do emails fail to send, and how can I fix it?<\/h2>\n\n<p class=\"wp-block-paragraph\">Don\u2019t give up too easily \u2013 just because your email failed to send this time doesn\u2019t mean you\u2019ve stumbled into an unfixable situation. The reasons your email failed to send vary from the mundane (bad internet connection) to the technically complex (server issues \u2013 like your SMTP server connection).<\/p>\n\n<p class=\"wp-block-paragraph\">Here are some common reasons your email messages won\u2019t send:<\/p>\n\n<ol class=\"wp-block-list\">\n<li>You\u2019re not connected to the internet.<\/li>\n\n\n\n<li>You\u2019ve set up your email client with the wrong SMTP parameters.<\/li>\n\n\n\n<li>Your SMTP server connection is malfunctioning.<\/li>\n\n\n\n<li>You\u2019re using the wrong SMTP port.<\/li>\n\n\n\n<li>Your firewall settings are getting in the way.<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\">Let\u2019s unpack each of these below and walk through some troubleshooting steps.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Failure to send is a big email issue, but so is landing in the spam folder. If your messages are going through but just not being read, <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/evitar-e-mails-no-spam\/\">click here.<\/a><\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">1. You\u2019re not connected to the internet<\/h3>\n\n<p class=\"wp-block-paragraph\">Have you tried turning it off and on? Okay, we don\u2019t mean to make light of the situation, but sometimes this happens. Check your internet connection first before tearing apart your SMTP server setup. Sometimes, the issue really is just that simple.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>How to fix: <\/b>Check your internet connection, or confirm any outages in your area that may have affected your send time.<\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">2. You\u2019ve set up your email client with the wrong SMTP parameters<\/h3>\n\n<p class=\"wp-block-paragraph\">Are your emails not sending in Microsoft Outlook or Gmail via your app integration? Chances are you\u2019ve set up your webmail client with the wrong SMTP authentication or made a few typos.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>How to fix: <\/b>Check out this list of the most common parameters and see if you\u2019ve set up your email client correctly.<\/div>\r\n    <\/div>\r\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\nEmai\u00adl serv\u00adice prov\u00adider\n<\/th><th>\nSMTP\u00ad sett\u00adings\n<\/th><\/tr><\/thead><tbody><tr><td>\nAOL\n<\/td><td>\nSmtp.aol.com\n<\/td><\/tr><tr><td>\nAT&amp;T\n<\/td><td>\nOut\u00adbo\u00adund\n<\/td><\/tr><tr><td>\nCom\u00adca\u00adst\n<\/td><td>\nSmtp.comcast.net\n<\/td><\/tr><tr><td>\nGma\u00adil\n<\/td><td>\nSmtp.gmail.com\n<\/td><\/tr><tr><td>\nOut\u00adlo\u00adok\n<\/td><td>\nSmtp.live.com\n<\/td><\/tr><tr><td>\nVer\u00adiz\u00adon\n<\/td><td>\nOut\u00adgo\u00ading\n<\/td><\/tr><tr><td>\nYah\u00adoo\n<\/td><td>\nSmtp.mail.yahoo.com\n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\">3. Your SMTP server connection is malfunctioning<\/h3>\n\n<p class=\"wp-block-paragraph\">Okay, this is where it gets tricky. Your SMTP server connection may be malfunctioning. If your SMTP parameters are correctly set up, your email server may be down or not functioning.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>How to fix: <\/b>Here\u2019s a list of common <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc5321#section-4.2\">SMTP response codes<\/a> and some <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/comandos-smtp\/\">SMTP commands<\/a> to help you troubleshoot <!-- -->your email sending issue<!-- -->.<\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">4. You\u2019re using the wrong SMTP port<\/h3>\n\n<p class=\"wp-block-paragraph\">The old school convention states that your outgoing mail server should use port 25. However, some inbox service providers (ISPs \u2013 not to be confused with internet service providers) block port 25 because of spam issues.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>How to fix: <\/b>Try using port 587 instead. For our full breakdown of which SMTP port to use, <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/email\/qual-porta-smtp-entendendo-as-portas-25-465-587\/\">check out our guide.<\/a><\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">5. Your firewall settings are getting in the way<\/h3>\n\n<p class=\"wp-block-paragraph\">That\u2019s right, check your antivirus or firewall settings. Sometimes, outgoing email can be blocked by your own privacy protection protocols.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>How to fix: <\/b>Set up a proper exception rule for your firewall or antivirus program.<\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">4 tips to avoid the \u2018email failed to send\u2019 message<\/h2>\n\n<p class=\"wp-block-paragraph\">The best way to fix a problem is to prevent it. With that being said, here are five ways to avoid that dreaded \u201cemail failed to send\u201d message:<\/p>\n\n<ol class=\"wp-block-list\">\n<li><b>Check your internet connection and email password.<\/b> Typos and human errors are easy. Save yourself a few headaches by making sure your Wi-Fi connection works and that your authentication protocols are all properly set up before you hit send.<\/li>\n\n\n\n<li><b>Check your SMTP server details. <\/b>Ensure you\u2019ve correctly entered the right parameters and that your mail server is functioning as intended.<\/li>\n\n\n\n<li><b>Use the correct SMTP port.<\/b> Port 587 is considered the default SMTP port for mail transfer, and it\u2019s what you should use unless you\u2019re blocked by your network or internet provider.<\/li>\n\n\n\n<li><b>Use an ESP that provides an SMTP relay service. <\/b>ESPs, like Mailgun, provide an <a href=\"https:\/\/www.mailgun.com\/pt\/products\/send\/smtp\/free-smtp-service\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SMTP relay service<\/a> that helps you circumvent all the headaches associated with running your own SMTP server. Leave delivery failures in the dust while the pros manage your <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/praticas-recomendadas-sucesso-entrega-e-mails\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email delivery<\/a>.<\/li>\n<\/ol>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>Bonus tip:<\/b> Email delivery is just one battle in the war to get your message read. <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/melhorar-taxa-entrega-e-mail\/\">Check out our guide on email deliverability<\/a> to benefit from things like email authentication, IP address warmup, and other techniques to build your reputation as a trusted sender.<\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">What if my emails won\u2019t send via API?<\/h2>\n\n<p class=\"wp-block-paragraph\">There are other ways to send mail, especially if you send in bulk. If you\u2019re a programmatic sender, a failure to send error can be a much bigger deal, impacting a large volume of transactional emails. Here are some common API sending issues and troubleshooting tips to help you identify why your emails won\u2019t send.<\/p>\n\n<ol class=\"wp-block-list\">\n<li><b>Incorrect API endpoint or credentials: <\/b>Double-check that you are using the <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/email\/guide-to-api-endpoints\/\" target=\"_tabs\" rel=\"noopener noreferrer\">correct API endpoint<\/a> for sending your emails and ensure that your API key is correct and has the necessary permissions. This happens more often than you might think.<\/li>\n\n\n\n<li><b>Rate limiting: <\/b>Does your email service provider rate limit? Some APIs have rate limits set to prevent abuse. Rate limiting can also be part of an account tier, pricing plan, or permissions level. Make sure you\u2019re not hitting rate limits by sending too many requests in a short amount of time.<\/li>\n\n\n\n<li><b>API configuration: <\/b>Check that you\u2019ve configured your API correctly. This includes setting up sender email addresses, recipient addresses, subject, body, and attachments.<\/li>\n\n\n\n<li><b>Email content: <\/b>Some email APIs can have content policies around their elements, (subject, body, attachment) to ensure the content isn\u2019t built in a way that would trigger spam filters. Make sure you are following <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/praticas-recomendadas-sucesso-entrega-e-mails\/\" target=\"_tabs\" rel=\"noopener noreferrer\">best practices<\/a> to avoid this.<\/li>\n<\/ol>\n\n<h2 class=\"wp-block-heading\">The importance of sender reputation in email deliverability<\/h2>\n\n<p class=\"wp-block-paragraph\">Sender reputation plays a big role in whether your emails make it to the inbox or get flagged as spam. With tools like Mailgun\u2019s reputation monitoring, you can spot and fix issues before they become a problem. Verifying email addresses is another simple way to keep your list clean and reduce bounces, which goes a long way in keeping your emails on track.<\/p>\n    <div data-content-type=\"longform\" class=\"quote hub-quote longform-spacings d-flex flex-column rounded-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 shadow-sm bg-primary\" data-theme=\"light\">\r\n\r\n        <div class=\"quote-logo mb-3\">\r\n                            <svg height=\"40\" class=\"quote-icon quote-icon-color\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/custom-icons\/quotes-right.svg\"><\/svg>\r\n                    <\/div>\r\n\r\n        <blockquote class=\"quote-content content-body m-0 text-body-color\" id=\"quote-block-8c19e61c8827371b8fedb8d02c25dad5\">\r\n            &#8220;Merely meeting the authentication standard is not the thing that&#8217;s going to guarantee inbox placement \u2013 it&#8217;s just a bare minimum.&#8221;        <\/blockquote>\r\n\r\n                    <div class=\"d-flex gap-3 mt-5\">\r\n                                    <div>\r\n                        <img decoding=\"async\" width=\"72\" height=\"72\" class=\"rounded-lg quote-author\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Alison-Gootee_Headshot.jpg\" alt=\"Foto de Alison Gootee\">\r\n                    <\/div>\r\n                                <div class=\"d-flex flex-column align-self-center fs-sm\">\r\n                    <cite class=\"mb-0 fw-bold text-accent fst-normal\" aria-describedby=\"quote-block-8c19e61c8827371b8fedb8d02c25dad5\">\r\n                        Alison Gootee                    <\/cite>\r\n                                            <span class=\"mb-0 text-body-color\">Deliverability Advocacy Specialist, Sinch Mailgun<\/span>\r\n                                    <\/div>\r\n            <\/div>\r\n            <\/div>\r\n\n<p class=\"wp-block-paragraph\">In other words: authentication is foundational, but it\u2019s not enough on its own. Your domain\u2019s reputation, sending practices, and engagement metrics all contribute to your ability to land in the inbox.<\/p>\n\n<p class=\"wp-block-paragraph\">Here\u2019s a last list of quick resources if you are having other issues with sending emails:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Authentication: <\/b>You won\u2019t get far at all without setting up your email authentications. These protocols help validate your identity as a sender, and signal to receiving mail servers and providers that your messages are trustworthy and should be let into the inbox. Learn more in our post on <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/autenticacao-e-mail-identidade-envio\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email authentication<\/a>.<\/li>\n\n\n\n<li><b>Email bounces:<\/b> When sent emails bounce back, it can be because of something temporary like a connection issue or something more permanent. Get all the details in our post on <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/email-bounces-what-to-do-about-them\/\" target=\"_tabs\" rel=\"noopener noreferrer\">understanding email bounces<\/a>.<\/li>\n\n\n\n<li><b>Validation: <\/b>Keeping a clean email list is extremely important for deliverability. Why go through through all the trouble of setting up a good sending infrastructure if you\u2019re just going to send to an invalid email address? But sending to outdated or mistyped contacts doesn\u2019t just hurt your engagement metrics \u2013 it also sends a red flag to inbox providers that you might be a spammer. If you <i>did <\/i>obtain a recipient\u2019s email address unethically, that\u2019s even worse \u2013 and can land you on a blacklist. Wondering if you\u2019re practicing good list hygiene? <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/email-bounces-what-to-do-about-them\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Check out our<\/a> <!-- --> <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/email-bounces-what-to-do-about-them\/\" target=\"_tabs\" rel=\"noopener noreferrer\">list hygiene tips<\/a> here. <\/li>\n<\/ul>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Dive deeper and check out our guide on <a href=\"https:\/\/www.mailgun.com\/blog\/email\/understanding-email-deliverability\/\">understanding the importance of email deliverability<\/a>. It\u2019ll help you wrap your brain around everything from email authentications, to the importance of validating your email lists. Then, <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/conclusoes-do-estado-da-entregabilidade\/\">check out our report on the State of Email Deliverability in 2025<\/a> for more key insights.<\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">Wrapping up<\/h2>\n\n<p class=\"wp-block-paragraph\">Server settings and SMTP issues are a key culprit for failed email messages, but there are lots of reasons your outgoing emails may not make their way to the inbox. Resolving \u201cfailure to send\u201d doesn\u2019t automatically mean everything is perfect in terms of your deliverability.<\/p>\n\n<p class=\"wp-block-paragraph\">Interested in more resources? We have a lot. Be sure to subscribe to our newsletter so you don\u2019t miss out on useful email info.<\/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! 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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                <input type=\"hidden\" name=\"customListID\" value=\"\">\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 Mailjet Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>E-mails n\u00e3o entregues s\u00e3o frustrantes. 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