{"id":47457,"date":"2023-09-21T13:41:22","date_gmt":"2023-09-21T13:41:22","guid":{"rendered":"https:\/\/www.engagebay.com\/blog\/?p=47457"},"modified":"2024-09-12T08:01:00","modified_gmt":"2024-09-12T08:01:00","slug":"manage-email-bounce-codes","status":"publish","type":"post","link":"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/","title":{"rendered":"Learn To Manage Email Bounce Codes In 10 Minutes"},"content":{"rendered":"<p>Email bounces happen from time to time, but high bounce rates can put your <a href=\"https:\/\/www.engagebay.com\/blog\/sender-reputation-email-deliverability\/\">sender reputation<\/a> in jeopardy, restricting the number of emails you can send to your audiences.<\/p>\n<p>Further harming <a href=\"https:\/\/www.engagebay.com\/blog\/intro-to-email-deliverability\/\">email deliverability<\/a> is the possibility of being blacklisted if you have many hard bounces. Once you\u2019re on <a href=\"https:\/\/www.engagebay.com\/blog\/blacklists-greylists-whitelists-email-deliverability\/\">email blacklists<\/a>, you will have to fight tooth-and-nail to get off &#8217;em. It\u2019s doable but difficult.<\/p>\n<p>Familiarizing yourself with email bounce codes will go a long way toward helping you understand why your messages bounce so you can reduce your <a href=\"https:\/\/www.engagebay.com\/blog\/bounce-rates-email-deliverability\/\">bounce rates<\/a>.<\/p>\n<p>This is a detailed article, but it&#8217;ll still take less than 10 minutes to read. In this little guide, we will explain how to manage email bounce codes, and share a full list of email bounce codes and what they stand for.<\/p>\n<p><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><img decoding=\"async\" class=\"aligncenter wp-image-66157 size-full\" src=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png\" alt=\"Banner promoting over 1,000 free HTML email templates from EngageBay. Customize and send beautiful, easy-to-use email templates for impactful marketing campaigns. Try for free.\" width=\"770\" height=\"206\" srcset=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png 770w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-300x80.png 300w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-768x205.png 768w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/#What_Is_an_Email_Bounce\" >What Is an Email Bounce?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/#Okay_So_Whats_an_Email_Bounce_Code\" >Okay, So What\u2019s an Email Bounce Code?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/#Understanding_Email_Bounce_Codes_The_Full_List_and_What_They_Mean\" >Understanding Email Bounce Codes: The Full List and What They Mean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/#How_To_Manage_Email_Bounce_Codes\" >How To Manage Email Bounce Codes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/#Bottom_Line\" >Bottom Line<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_Email_Bounce\"><\/span><span style=\"color: #339966;\"><b>What Is an Email Bounce?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let\u2019s take it from the top and briefly explain what it means when an email bounces. A bounced email is any email that has not reached the recipient. The internet service provider or <a href=\"https:\/\/www.engagebay.com\/blog\/isp-email-deliverability\/\">ISP returns<\/a> it to you, which will happen instantly after you send it.<\/p>\n<p>Depending on the cause of the bounce, you can try again later, recheck the recipient\u2019s details, and send again immediately, or contact a different email address.<\/p>\n<p>Bounces can be categorized in two ways: hard or soft. Let\u2019s review the differences.<\/p>\n<h3><span style=\"color: #993300;\"><b>Soft Bounce vs Hard Bounce<\/b><\/span><\/h3>\n<p>A soft email bounce is often a temporary error caused by the recipient or their server, not the sender. Here are some reasons you might get a soft bounce when you email a segment of your contact list:<\/p>\n<ul>\n<li>&nbsp; &nbsp; Their email server can\u2019t relay the message from your email server.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s email server requirements aren\u2019t met.<\/li>\n<li>&nbsp; &nbsp; The email doesn\u2019t pass the antivirus of the recipient server.<\/li>\n<li>&nbsp; &nbsp; The email got caught in the recipient\u2019s <a href=\"https:\/\/www.engagebay.com\/blog\/spam-filters-email-deliverability\/\">spam filter<\/a>.<\/li>\n<li>&nbsp; &nbsp; The email didn\u2019t pass the recipient server\u2019s authentication requirements, such as <a href=\"https:\/\/www.engagebay.com\/blog\/spf-dkim-dmarc-email-deliverability\/\">DMARC<\/a>.<\/li>\n<li>&nbsp; &nbsp; The message violates the recipient server\u2019s email policies.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s server blocks the content in the email.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s domain name no longer exists.<\/li>\n<li>&nbsp; &nbsp; The email is too big, usually due to attachments.<\/li>\n<li>&nbsp; &nbsp; The recipient server cannot receive emails due to sending out too many.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s server is offline.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s server is down.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s mailbox is incorrectly configured.<\/li>\n<li>&nbsp; &nbsp; The recipient\u2019s mailbox is full.<\/li>\n<\/ul>\n<p>The recipient doesn\u2019t receive an email that your <a href=\"https:\/\/www.engagebay.com\/blog\/bounce-back-emails\/\">message to them bounced<\/a>, so it\u2019s up to them to improve matters on their end (or their ISP to do it, depending on the source of the soft bounce).<\/p>\n<p>The other type of email bounce is a hard bounce. If soft bounces are temporary, hard bounces are permanent. For example, the recipient\u2019s server might have blocked your email address. The email address you\u2019re trying to reach might no longer exist, or you\u2019ve contacted an invalid domain name.<\/p>\n<p>Unlike a soft bounce, which the email recipient or <a href=\"https:\/\/www.engagebay.com\/blog\/isp-email-deliverability\/\">their ISP<\/a> might ameliorate in due time, there\u2019s usually no return from a hard bounce. You can check the recipient\u2019s email address and confirm you have everything spelled correctly, but you must remove them from your list outside of that.<\/p>\n<p>You can calculate your soft vs hard bounces through your <a href=\"https:\/\/www.engagebay.com\/blog\/bounce-rates-email-deliverability\/\">email bounce rate<\/a>, which is the number of emails bounced divided by how many you sent.<\/p>\n<p>A good bounce rate is around one percent (1%).<\/p>\n<hr>\n<h4><span style=\"color: #666699;\"><b>Enhance Your Email Marketing<\/b><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">Want to make your emails more impactful? Check out our beautiful, easy-to-customize recruitment and <\/span><a href=\"https:\/\/www.engagebay.com\/email-templates\/email-purpose\/marketing\"><span style=\"font-weight: 400;\">marketing email templates<\/span><\/a><span style=\"font-weight: 400;\">. Designed to boost engagement, these templates from EngageBay will help your emails stand out. Just customize the images, headings, and CTAs for your brand, and hit send in a few minutes!<\/span><\/p>\n<p style=\"text-align: center;\">&nbsp;<span style=\"font-weight: 400;\"><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-color=\"\" href=\"https:\/\/www.engagebay.com\/email-templates\/\">Browse the Template Library<\/a><\/span>&nbsp;<\/p>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"Okay_So_Whats_an_Email_Bounce_Code\"><\/span><span style=\"color: #339966;\"><b>Okay, So What\u2019s an Email Bounce Code?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524.png\"><img decoding=\"async\" class=\"aligncenter wp-image-43250\" src=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524.png\" alt=\"How to identify an email bounce message\" width=\"685\" height=\"314\" srcset=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524.png 1050w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524-300x137.png 300w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524-1024x469.png 1024w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524-768x352.png 768w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2023\/06\/Screenshot-524-595xh.png 595w\" sizes=\"(max-width: 685px) 100vw, 685px\" \/><\/a><\/p>\n<p>Every email bounce, whether soft or hard, generates an email bounce code.<\/p>\n<p>The bounce code explains why your email didn\u2019t reach the intended recipient. You can receive a regular bounce code or an enhanced SMTP bounce code, which can be very different.<\/p>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49 Elevate your email marketing with our <\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><i><span style=\"font-weight: 400;\">free email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\"> designed to boost engagement.<\/span><\/i><\/p>\n<h3><span style=\"color: #993300;\"><b>Traditional and Enhanced SMTP Bounce Codes \u2013 What\u2019s the Difference?<\/b><\/span><\/h3>\n<p>SMTP is short for <a href=\"https:\/\/en.wikipedia.org\/wiki\/Simple_Mail_Transfer_Protocol\">Simple Mail Transfer Protocol<\/a>. All email servers use an SMTP to relay, send, and receive emails. A traditional SMTP bounce code will have a three-digit identifier indicating whether the email was sent.<\/p>\n<p>The three-digit code tells you precisely why the email failed to reach the recipient, provided you understand what the code means.<\/p>\n<p>In 2003, enhanced SMTP bounce codes were born. Traditional SMTP codes were helpful but only revealed so much, while the enhanced codes shed much more light on the matter. An enhanced SMTP code also has three digits but periods in between them.<\/p>\n<p>What does each of the three digits mean? The first represents the email delivery class. A 2.X.X refers to a delivery that reached the recipient. If you see a 4.X.X, that indicates a soft bounce or a temporary issue. A 5.X.X is a hard bounce due to a permanent issue.<\/p>\n<p>To recap, the first digit of an enhanced SMTP code can be a 2, 4, or 5.<\/p>\n<p>The second digit represents an error code. If you see a 1 in the second spot, your email didn\u2019t send because of an address issue. A 2 represents a mailbox problem, and a 3 means it\u2019s an issue with the mail server.<\/p>\n<p>The second digit of an enhanced SMTP code can be a 1, 2, or 3. Then, there\u2019s the third digit, which further elaborates on the email issue. This can be between 0 and 5.<\/p>\n<p>ISPs use traditional and enhanced SMTP codes to help email senders understand why their messages failed.<\/p>\n<p><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><img decoding=\"async\" class=\"aligncenter wp-image-66157 size-full\" src=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png\" alt=\"Banner promoting over 1,000 free HTML email templates from EngageBay. Customize and send beautiful, easy-to-use email templates for impactful marketing campaigns. Try for free.\" width=\"770\" height=\"206\" srcset=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png 770w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-300x80.png 300w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-768x205.png 768w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/a><\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/bounce-back-emails\/\">Read also: Bounce Back Emails: What Are They And How To Fix Them<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_Email_Bounce_Codes_The_Full_List_and_What_They_Mean\"><\/span><span style=\"color: #339966;\"><b>Understanding Email Bounce Codes: The Full List and What They Mean<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let\u2019s put all the information together from the prior section and review the common bounce codes and what they mean when you receive them.<\/p>\n<h3><span style=\"color: #993300;\"><b>Status Group Codes<\/b><\/span><\/h3>\n<p>A status group code refers to the first of the three digits in an enhanced SMTP code and is as follows.<\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><b>Status Group Code<\/b><\/td>\n<td style=\"text-align: center;\"><b>What It Means<\/b><\/td>\n<\/tr>\n<tr>\n<td>1XX<\/td>\n<td>Informational group indicating the server received and is still processing your request.<\/td>\n<\/tr>\n<tr>\n<td>2XX<\/td>\n<td>The server successfully got your request and has accepted it.<\/td>\n<\/tr>\n<tr>\n<td>3XX<\/td>\n<td>Redirection group indicating that the server must do more to fulfill the request.<\/td>\n<\/tr>\n<tr>\n<td>4XX<\/td>\n<td>Client error indicating the server could not fulfill the request, or it has bad syntax.<\/td>\n<\/tr>\n<tr>\n<td>5XX<\/td>\n<td>Server error indicating the server couldn\u2019t fulfill the request but not due to any errors on the sender\u2019s part.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"color: #993300;\"><b>4XX Codes<\/b><\/span><\/h3>\n<p>Soft bounce codes begin with 4, such as 4XX (a traditional SMTP bounce code) or 4.X.X (an enhanced SMTP bounce code). Here\u2019s an overview of each code and its meaning.<\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><b>Code&nbsp;<\/b><\/td>\n<td style=\"text-align: center;\"><b>What It Means<\/b><\/td>\n<\/tr>\n<tr>\n<td>420<\/td>\n<td>An error occurred when transferring the message, and the connection timed out.<\/td>\n<\/tr>\n<tr>\n<td>421<\/td>\n<td>The recipient\u2019s server cannot receive the message because of excess connections or messages. The email is deferred until the recipient can receive messages again.<\/td>\n<\/tr>\n<tr>\n<td>422<\/td>\n<td>The recipient\u2019s inbox is full and has no storage space left.<\/td>\n<\/tr>\n<tr>\n<td>431<\/td>\n<td>The recipient has a file overload and is out of memory or disk space.<\/td>\n<\/tr>\n<tr>\n<td>432<\/td>\n<td>The arriving mail queue was stopped due to the exchange server.<\/td>\n<\/tr>\n<tr>\n<td>441<\/td>\n<td>The recipient\u2019s server has stopped responding.<\/td>\n<\/tr>\n<tr>\n<td>442<\/td>\n<td>The recipient\u2019s server lost connection while the transmission occurred.<\/td>\n<\/tr>\n<tr>\n<td>446<\/td>\n<td>The recipient has exceeded their email hop count and caused an internal loop error.<\/td>\n<\/tr>\n<tr>\n<td>447<\/td>\n<td>The incoming server had an issue, causing the email you sent to time out.<\/td>\n<\/tr>\n<tr>\n<td>449<\/td>\n<td>Routing issues, possibly caused by configuration trouble, prevented the server exchange.<\/td>\n<\/tr>\n<tr>\n<td>450<\/td>\n<td>The mailbox is busy or otherwise unavailable.<\/td>\n<\/tr>\n<tr>\n<td>451<\/td>\n<td>The message could not be processed and was aborted.<\/td>\n<\/tr>\n<tr>\n<td>452<\/td>\n<td>The system lacks enough storage to send the email.<\/td>\n<\/tr>\n<tr>\n<td>471<\/td>\n<td>A local anti-spam filter prevented the email from going through.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49&nbsp; Boost your marketing strategy with our <\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><i><span style=\"font-weight: 400;\">customizable email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\"> that drive results.<\/span><\/i><\/p>\n<h3><span style=\"color: #993300;\"><b>5XX Codes<\/b><\/span><\/h3>\n<p>Hard bounce codes begin with a 5, either a 5XX or a 5.X.X. Here is a complete overview of all the codes you might receive when a permanent error occurs during email sending.<\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><b>Code<\/b><\/td>\n<td style=\"text-align: center;\"><b>What It Means<\/b><\/td>\n<\/tr>\n<tr>\n<td>500<\/td>\n<td>The email address doesn\u2019t exist.<\/td>\n<\/tr>\n<tr>\n<td>501<\/td>\n<td>Command arguments encountered a syntax error.<\/td>\n<\/tr>\n<tr>\n<td>502<\/td>\n<td>The server cannot implement the requested command.<\/td>\n<\/tr>\n<tr>\n<td>503<\/td>\n<td>A sequence of commands has prevented the server from proceeding.<\/td>\n<\/tr>\n<tr>\n<td>504<\/td>\n<td>The recipient could not implement the command parameter.<\/td>\n<\/tr>\n<tr>\n<td>510<\/td>\n<td>You\u2019re trying to reach a bad or invalid email address.<\/td>\n<\/tr>\n<tr>\n<td>511<\/td>\n<td>You\u2019re trying to reach a bad or invalid destination.<\/td>\n<\/tr>\n<tr>\n<td>512<\/td>\n<td>The recipient\u2019s server had a DNS error and could not find the domain name for the recipient.<\/td>\n<\/tr>\n<tr>\n<td>513<\/td>\n<td>An address has been misspelled or cannot be authenticated.<\/td>\n<\/tr>\n<tr>\n<td>514<\/td>\n<td>The recipient\u2019s mailbox address is deemed ambiguous, and cannot receive the message.<\/td>\n<\/tr>\n<tr>\n<td>515<\/td>\n<td>The mailbox address is invalid.<\/td>\n<\/tr>\n<tr>\n<td>516<\/td>\n<td>The mailbox has moved.<\/td>\n<\/tr>\n<tr>\n<td>517<\/td>\n<td>A bad mailbox address syntax has prevented the recipient\u2019s server from receiving your message.<\/td>\n<\/tr>\n<tr>\n<td>518<\/td>\n<td>A bad system address has prevented the recipient\u2019s server from receiving your message.<\/td>\n<\/tr>\n<tr>\n<td>520<\/td>\n<td>The recipient\u2019s mailbox status is undefined.<\/td>\n<\/tr>\n<tr>\n<td>521<\/td>\n<td>The recipient\u2019s mailbox is no longer accepting messages due to being disabled.<\/td>\n<\/tr>\n<tr>\n<td>522<\/td>\n<td>The recipient\u2019s mailbox is full, and they can no longer receive messages until they empty it.<\/td>\n<\/tr>\n<tr>\n<td>523<\/td>\n<td>You\u2019re trying to send an email that exceeds the limits of the recipient\u2019s server.<\/td>\n<\/tr>\n<tr>\n<td>524<\/td>\n<td>The mailing list could not be expanded.<\/td>\n<\/tr>\n<tr>\n<td>530<\/td>\n<td>The recipient\u2019s email address is invalid, the recipient\u2019s server blacklisted your email address, or authentication issues.<\/td>\n<\/tr>\n<tr>\n<td>532<\/td>\n<td>The system cannot accept network messages.<\/td>\n<\/tr>\n<tr>\n<td>533<\/td>\n<td>The system cannot accept some selected features.<\/td>\n<\/tr>\n<tr>\n<td>534<\/td>\n<td>The size of the message exceeds the allowable system size.<\/td>\n<\/tr>\n<tr>\n<td>540<\/td>\n<td>The routing status or network is undefined.<\/td>\n<\/tr>\n<tr>\n<td>541<\/td>\n<td>An anti-spam filter or other measure rejected the message by recipient address.<\/td>\n<\/tr>\n<tr>\n<td>542<\/td>\n<td>Poor connection.<\/td>\n<\/tr>\n<tr>\n<td>543<\/td>\n<td>The routing server failed.<\/td>\n<\/tr>\n<tr>\n<td>544<\/td>\n<td>The server cannot route.<\/td>\n<\/tr>\n<tr>\n<td>545<\/td>\n<td>The network is congested.<\/td>\n<\/tr>\n<tr>\n<td>546<\/td>\n<td>The network detected a routing loop.<\/td>\n<\/tr>\n<tr>\n<td>547<\/td>\n<td>The period for delivery expired.<\/td>\n<\/tr>\n<tr>\n<td>550<\/td>\n<td>The server could not find the recipient\u2019s mailbox.<\/td>\n<\/tr>\n<tr>\n<td>551<\/td>\n<td>The recipient isn\u2019t a local part of the server.<\/td>\n<\/tr>\n<tr>\n<td>552<\/td>\n<td>The storage allocation was exceeded, and the request was aborted.<\/td>\n<\/tr>\n<tr>\n<td>553<\/td>\n<td>The mailbox name was invalid, and the request was aborted.<\/td>\n<\/tr>\n<tr>\n<td>554<\/td>\n<td>The email transaction failed, although for reasons not stated.<\/td>\n<\/tr>\n<tr>\n<td>555<\/td>\n<td>The protocol version is incorrect.<\/td>\n<\/tr>\n<tr>\n<td>560<\/td>\n<td>A media error occurred.<\/td>\n<\/tr>\n<tr>\n<td>561<\/td>\n<td>The type of media sent is not supported.<\/td>\n<\/tr>\n<tr>\n<td>562<\/td>\n<td>The required conversion is prohibited.<\/td>\n<\/tr>\n<tr>\n<td>563<\/td>\n<td>The required conversion is not supported.<\/td>\n<\/tr>\n<tr>\n<td>564<\/td>\n<td>The conversion occurred but with a loss.<\/td>\n<\/tr>\n<tr>\n<td>565<\/td>\n<td>The conversion could not occur.<\/td>\n<\/tr>\n<tr>\n<td>570<\/td>\n<td>The security status is undefined.<\/td>\n<\/tr>\n<tr>\n<td>571<\/td>\n<td>The message was refused due to unauthorized delivery.<\/td>\n<\/tr>\n<tr>\n<td>572<\/td>\n<td>The server prohibited mailing list expansion.<\/td>\n<\/tr>\n<tr>\n<td>573<\/td>\n<td>The required security conversion could not occur.<\/td>\n<\/tr>\n<tr>\n<td>574<\/td>\n<td>The required security conversion is not supported.<\/td>\n<\/tr>\n<tr>\n<td>575<\/td>\n<td>A cryptographic error or failure occurred.<\/td>\n<\/tr>\n<tr>\n<td>576<\/td>\n<td>The required cryptographic algorithm isn\u2019t supported.<\/td>\n<\/tr>\n<tr>\n<td>577<\/td>\n<td>The message integrity failed.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><img decoding=\"async\" class=\"aligncenter wp-image-66157 size-full\" src=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png\" alt=\"Banner promoting over 1,000 free HTML email templates from EngageBay. Customize and send beautiful, easy-to-use email templates for impactful marketing campaigns. Try for free.\" width=\"770\" height=\"206\" srcset=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png 770w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-300x80.png 300w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-768x205.png 768w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/a><\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/bounce-rates-email-deliverability\/\">Read also: Bounce Rates and Email Deliverability \u2013 A Simple Guide<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_To_Manage_Email_Bounce_Codes\"><\/span><span style=\"color: #339966;\"><b>How To Manage Email Bounce Codes<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Bounced emails put your <a href=\"https:\/\/www.engagebay.com\/blog\/sender-reputation-email-deliverability\/\">sender reputation<\/a> at risk if they happen frequently enough, including hard and soft bounces alike.<\/p>\n<p>Although you can\u2019t control what your email recipients do or how their server behaves, you have plenty within your power to reduce your company\u2019s email bounce rate.<\/p>\n<p>Here are some pointers.<\/p>\n<h3><span style=\"color: #993300;\"><b>Pause emails to the recipient<\/b><\/span><\/h3>\n<p>You\u2019ve determined the intended recipient cannot accept emails at current, likely due to a temporary issue. Check the bounce code; if you see a code beginning with a 4, it\u2019s a soft bounce that should be rectified when possible.<\/p>\n<p>In the interim, it does no good to continue sending emails, as they will all bounce. Instead, temporarily pause emails to that recipient. A pause might mean 24 or 48 hours or even a week. It\u2019s your choice how long you decide to wait.<\/p>\n<p>Try sending the email again and decide how to proceed based on whether you get the same error, a different error, or no error.<\/p>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49 Optimize your marketing efforts with our <\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><i><span style=\"font-weight: 400;\">email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\"> designed for efficiency and impact.<\/span><\/i><\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/email-list-cleaning\/\">Read also: Email List Cleaning \u2013 It\u2019s Time To Give Yours A Good Scrub<\/a><\/p>\n<h3><span style=\"color: #993300;\"><b>Remove inactive email addresses<\/b><\/span><\/h3>\n<p>If you\u2019re still receiving 4XX or 4.X.X email bounces from the recipient, despite a temporary bounce, that doesn\u2019t mean it will always be addressed. Soft bounces are on the part of the recipient, such as a full email inbox.<\/p>\n<p>You don\u2019t want to hold your breath waiting for the email recipient to empty their inbox, as you don\u2019t have any way of knowing how long you\u2019ll wait. Instead, remove them (and any other inactive addresses) from <a href=\"https:\/\/www.engagebay.com\/blog\/email-list-quality-email-deliverability\/\">your email list<\/a>.<\/p>\n<p>If the recipient gets their email issues fixed and realizes they aren\u2019t receiving your emails, they can sign up for your email list again. In the meantime, keeping them on your list could put you at risk of your ISP assuming you\u2019re engaging with spam traps, thus hurting your sender reputation.<\/p>\n<p>If you\u2019ve received a 5XX or 5.X.X email bounce, remove the recipient immediately. These permanent issues are highly unlikely to be fixed.<\/p>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49 Enhance your campaigns with our <\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><i><span style=\"font-weight: 400;\">free, customizable email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\"> that drive results.<\/span><\/i><\/p>\n<h3><span style=\"color: #993300;\"><b>Validate email addresses<\/b><\/span><\/h3>\n<p>Do you validate your emails before sending them? This is a great way to reduce the amount that will bounce. You can use free email verification through some services, so even startups can begin validating email addresses.<\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/smtp-response-codes\/\">Read also: 29 Critical SMTP Response Codes And How To Fix Them<\/a><\/p>\n<h3><span style=\"color: #993300;\"><b>Use double opt-ins<\/b><\/span><\/h3>\n<p>People accidentally end up on email lists all the time, whether a company unscrupulously sold their email address as part of a list sale or they signed up and completely forgot.<\/p>\n<p>Instituting <a href=\"https:\/\/www.engagebay.com\/blog\/best-opt-in-email-strategies\/\">double opt-ins<\/a> during signup reduces the rate of unintended signups, no matter the reason. You\u2019ll improve your open and click-through rates and reduce your bounce rate.<\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/smtp\/\">Read also: What Is Simple Mail Transfer Protocol (SMTP)? A Brief Guide<\/a><\/p>\n<h3><span style=\"color: #993300;\"><b>Follow good email hygiene<\/b><\/span><\/h3>\n<p>Double opt-ins are one part of proper email hygiene, which means following best practices to maintain your sender reputation.<\/p>\n<p>Here is a list of behaviors to begin implementing if you aren\u2019t already.<\/p>\n<ul>\n<li>&nbsp; &nbsp; Do not use spam words in your <a href=\"https:\/\/www.engagebay.com\/blog\/best-email-subject-lines\/\">subject lines<\/a> or email bodies.<\/li>\n<li>&nbsp; &nbsp; Don\u2019t mislead or lie to your audience in the subject line.<\/li>\n<li>&nbsp; &nbsp; Make it simple for anyone to unsubscribe, so if they\u2019ve changed their minds or no longer want to be part of your email list, they can very easily exit.<\/li>\n<li>&nbsp; &nbsp; Keep your email list full of engaged subscribers, removing inactive emails that bounce.<\/li>\n<li>&nbsp; &nbsp; Find an email cadence that works for your audience. Perhaps you email them once or twice a week, or maybe every few days, but it should be a rate most of your customers find agreeable.<\/li>\n<li>&nbsp; &nbsp; Optimize your emails for mobile and desktop users.<\/li>\n<li>&nbsp; &nbsp; <a href=\"https:\/\/www.engagebay.com\/blog\/what-is-audience-segmentation\/\">Segment your audience<\/a>.<\/li>\n<li>&nbsp; &nbsp; Personalize your emails.<\/li>\n<li>&nbsp; &nbsp; <a href=\"https:\/\/www.engagebay.com\/blog\/email-ab-testing\/\">A\/B test your emails<\/a> before sending them.<\/li>\n<li>&nbsp; &nbsp; Ensure your hyperlinks and CTAs are clear about where they\u2019ll redirect the user.<\/li>\n<li>&nbsp; &nbsp; Don\u2019t use spammy practices in the preview text.<\/li>\n<li>&nbsp; &nbsp; Never attach anything to your emails unless the user already knows about it.<\/li>\n<li>&nbsp; &nbsp; Do not write overly long emails.<\/li>\n<li>&nbsp; &nbsp; Always send emails from the same server and address.<\/li>\n<li>&nbsp; &nbsp; Send <a href=\"https:\/\/www.engagebay.com\/blog\/welcome-email\/\">welcome emails<\/a> to all new subscribers, and without delay.<\/li>\n<\/ul>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49&nbsp; Boost your email marketing campaigns with EngageBay\u2019s <\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><i><span style=\"font-weight: 400;\">customizable email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\"> tailored for engagement and success.<\/span><\/i><\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" href=\"https:\/\/www.engagebay.com\/blog\/email-verification-email-templates\/\" rel=\"noopener\">Read also: Email Verification Email Templates to Cut Down Bounce Rates<\/a><\/p>\n<h3><span style=\"color: #993300;\"><b>Watch your sending limits<\/b><\/span><\/h3>\n<p>Do you use a free email server? Many of them institute send limits.<\/p>\n<p>For example, Gmail only allows paid users to send 2,000 emails daily, and it\u2019s 500 if you have a free account. You can go through that number of emails fast as a large corporation, but all emails over the limit will bounce.<\/p>\n<p>Consider moving to your own server with greater limits. This will also build trust and credibility. However, you can <a href=\"https:\/\/www.engagebay.com\/blog\/ip-warming-email-deliverability\/\">warm up your IP<\/a> by gradually increasing your volume of emails before you launch <a href=\"https:\/\/www.engagebay.com\/blog\/email-blast-examples\/\">an&nbsp;email blast<\/a>.<\/p>\n<p>If you don\u2019t, your ISP will likely block your messages.<\/p>\n<p><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"><img decoding=\"async\" class=\"aligncenter wp-image-66157 size-full\" src=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png\" alt=\"Banner promoting over 1,000 free HTML email templates from EngageBay. Customize and send beautiful, easy-to-use email templates for impactful marketing campaigns. Try for free.\" width=\"770\" height=\"206\" srcset=\"https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1.png 770w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-300x80.png 300w, https:\/\/www.engagebay.com\/blog\/wp-content\/uploads\/2024\/08\/Final-Email-Blog-CTA-770x206-1-768x205.png 768w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/a><\/p>\n<p><a class=\"fasc-button fasc-size-medium fasc-type-flat fasc-rounded-medium ico-fa fasc-ico-before fa-arrow-circle-right\" style=\"background-color: #33809e; color: #ffffff;\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.engagebay.com\/blog\/isp-email-deliverability\/\">Read also: ISP and Email Deliverability: How To Hit The Inbox Always<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Bottom_Line\"><\/span><span style=\"color: #339966;\"><b>Bottom Line<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Email bounce codes are broadly categorized by soft and hard bounces. The codes reveal what went wrong so you can remedy the issue, even if that\u2019s merely by pruning your email list.<\/p>\n<p>If you want help with your email marketing, <a href=\"https:\/\/www.engagebay.com\/\">try EngageBay<\/a> for free. Thousands of small business owners love this tool, and it comes with integrated <a href=\"https:\/\/www.engagebay.com\/products\/crm\">CRM<\/a> &amp; helpdesk solutions.<\/p>\n<p><i><span style=\"font-weight: 400;\">\ud83d\udc49 Have you tried our<\/span><\/i><a href=\"https:\/\/www.engagebay.com\/email-templates\/\"> <i><span style=\"font-weight: 400;\">email templates<\/span><\/i><\/a><i><span style=\"font-weight: 400;\">? Share your experience in the comments below, and let us know how they worked for your campaigns!<\/span><\/i><\/p>\n\r\n            <script>\r\n                var EhAPI = EhAPI || {}; \r\n                EhAPI.after_load = function() {\r\n                    EhAPI.set_account('ktb76s1540fl2hnhbqnrtd2npb', 'our');\r\n                    EhAPI.execute('rules');\r\n                };\r\n                (function(d, s, f) {\r\n                    var sc = document.createElement(s);\r\n                    sc.type = 'text\/javascript';\r\n                    sc.async = true;\r\n                    sc.src = f;\r\n                    var m = document.getElementsByTagName(s)[0];\r\n                    m.parentNode.insertBefore(sc, m);   \r\n                })(document, 'script', '\/\/d2p078bqz5urf7.cloudfront.net\/jsapi\/ehform.js');\r\n            <\/script>\r\n            <script>\r\n                function waitForEhForms() {\r\n                    const interval = 100; \/\/ Check every 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bounces happen from time to time, but high bounce rates can put your sender reputation in jeopardy, restricting the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":47857,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[49],"tags":[8505,8779,8507,271,8778],"class_list":["post-47457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-marketing","tag-email-bounce","tag-email-bounce-codes","tag-email-bounce-rate","tag-email-deliverability","tag-manage-email-bounce-codes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.3 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Learn To Manage Email Bounce Codes In 10 Minutes<\/title>\n<meta name=\"description\" content=\"In this little guide, we will explain how to manage email bounce codes, and share a full list of email bounce codes and what they stand for.\" \/>\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.engagebay.com\/blog\/manage-email-bounce-codes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learn To Manage Email Bounce Codes In 10 Minutes\" \/>\n<meta property=\"og:description\" content=\"In this little guide, we will explain how to manage email bounce codes, and share a full list of email bounce codes and what they stand for.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.engagebay.com\/blog\/manage-email-bounce-codes\/\" \/>\n<meta property=\"og:site_name\" content=\"EngageBay - All-in-one marketing, sales, and service\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/engagebay\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-21T13:41:22+00:00\" \/>\n<meta property=\"article:modified_time\" 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