{"id":3888,"date":"2024-05-10T11:16:09","date_gmt":"2024-05-10T11:16:09","guid":{"rendered":"https:\/\/www.warmy.io\/blog\/how-to-fix-smtp-email-error-513-515-517-solved\/"},"modified":"2026-04-05T12:26:57","modified_gmt":"2026-04-05T12:26:57","slug":"how-to-fix-smtp-email-error-513-515-517-solved","status":"publish","type":"post","link":"https:\/\/www.warmy.io\/blog\/how-to-fix-smtp-email-error-513-515-517-solved\/","title":{"rendered":"SMTP Errors 513, 515, and 517: Invalid Address Type and Format Errors \u2014 Causes and Fixes"},"content":{"rendered":"<p>Email is still a mainstay of corporate communication in the digital age, supporting everything from everyday operations to major projects. Errors in SMTP (Simple Mail Transfer Protocol) email, however, can interfere with this vital line of communication, causing delays, lost chances, and even harm to reputation. SMTP Email Errors 513, 515, and 517 are especially problematic among these interruptions; they each indicate distinct problems that can have a major negative effect on email transmission.<\/p>\n<p>Maintaining the accuracy and effectiveness of corporate communications requires quick and efficient resolution of these mistakes. These particular SMTP issues will be examined in this article along with their causes and thorough fixes to guarantee the stability and dependability of your email systems. Companies can protect their email communications from any interruptions and preserve their operational continuity by fixing these mistakes.<\/p>\n<p><iframe width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/bCuDIuHXsm0\" frameborder=\"0\" allowfullscreen allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"><\/iframe><\/p>\n<h2>Understanding SMTP email error 513, 515, 517<\/h2>\n<p>Each of the SMTP email errors 513, 515, and 517 poses different difficulties and is usually accompanied by particular error messages that aid in identifying the underlying problems. Identification and resolution of the issues affecting email communication depend on an understanding of these communications.<\/p>\n<h3>SMTP Email Error 513<\/h3>\n<p>Usually, this problem shows up as<\/p>\n<blockquote>\n<p>\u201c513 Address type not supported\u201d.<\/p>\n<\/blockquote>\n<p>It happens when the recipient\u2019s email address has a syntax mistake or the email server is unable to parse the address.<\/p>\n<h3>SMTP Email Error 515<\/h3>\n<p>\u00a0Possible error message for this problem is<\/p>\n<blockquote>\n<p>\u201c515 Destination mailbox address invalid\u201d.<\/p>\n<\/blockquote>\n<p>It means that either the recipient\u2019s email address is not getting mails or does not exist on the receiving server. Restrictions on the receiving server, a domain that is no longer operational, or a typo of the email address might all be the cause.<\/p>\n<h3>SMTP Email Error 517<\/h3>\n<p>\u00a0One may see a notice saying,<\/p>\n<blockquote>\n<p>\u201c517 Problem with senders mail attribute, check syntax\u201d.<\/p>\n<\/blockquote>\n<p>This message indicates a problem with the email characteristics of the sender, including the email header format or other configuration settings that don\u2019t match the requirements of the receiving server.<\/p>\n<p>Users are notified by these error codes when particular problems with the email sending process require quick action. Whatever the issue \u2014 address syntax, server setup, or mail properties \u2014 each one needs a focused troubleshooting strategy to guarantee that communication is continuous and smooth.<\/p>\n<h2>Understanding the root causes of SMTP email errors 513, 515, and 517<\/h2>\n<p>SMTP Email Errors 513, 515, and 517 can stem from a variety of sources, each related to different aspects of the email sending and receiving process. Understanding these causes is key to diagnosing and fixing the issues effectively. Here\u2019s what typically leads to each of these errors:<\/p>\n<h3>SMTP Email Error 513: This error often arises from<br \/>\n<\/h3>\n<ul>\n<li><strong>Incorrect Email Format.<\/strong>\u00a0The email address format does not comply with standard email formatting rules. This could be due to missing elements like the \u201c@\u201d symbol or incorrect domain names.<\/li>\n<li><strong>Unsupported Address Types.<\/strong>\u00a0Some servers may not support certain types of email addresses or special configurations, leading to this error when encountering an unfamiliar address type.<\/li>\n<\/ul>\n<h3>SMTP Email Error 515: Common causes include<\/h3>\n<ul>\n<li><strong>Non-existent Email Address.<\/strong>\u00a0If the recipient\u2019s email address is typed incorrectly or if the domain name does not exist, the server will return this error.<\/li>\n<li><strong>Server Restrictions.<\/strong>\u00a0The receiving server may have strict policies regarding which email addresses are considered valid, or it may block emails from certain senders.<\/li>\n<\/ul>\n<h3>SMTP Email Error 517: This error is generally caused by<\/h3>\n<ul>\n<li><strong>Improper Email Header Configuration.<\/strong>\u00a0Errors in the email header, such as syntax mistakes or incomplete information, can lead to this error.<\/li>\n<li><strong>Misconfiguration of Sender Attributes.<\/strong>\u00a0Incorrect settings in the sender\u2019s email client or server, such as SMTP authentication issues or incorrect sender information, can trigger this error.<\/li>\n<\/ul>\n<h2>Step-by-Step Solutions to Resolve SMTP Email Error 513, 515, 517<\/h2>\n<p>Navigating through Salesforce to check and enhance email deliverability involves a series of steps tailored to different environments within the platform. Here\u2019s how you can ensure your emails are making their mark:<\/p>\n<h3>Resolving SMTP Email Error 513<\/h3>\n<ul>\n<li><strong>Verify Email Address Format.<\/strong>\u00a0Double-check the recipient\u2019s email address for any typos or formatting errors. Ensure it includes an \u2018@\u2019 symbol and a valid domain.<\/li>\n<li><strong>Check for Unsupported Features.<\/strong>\u00a0Some email services may not support certain special features or address types. Consult your service\u2019s help documentation to ensure compatibility.<\/li>\n<\/ul>\n<h3>Resolving SMTP Email Error 515<\/h3>\n<ul>\n<li><strong>Confirm the Recipient Address.<\/strong>\u00a0Re-enter the recipient\u2019s email address to make sure it is spelled correctly and actually exists. If possible, ask the recipient to confirm their email address.<\/li>\n<li><strong>Check Server Restrictions.<\/strong>\u00a0Contact the administrator of the recipient\u2019s email server to ensure that there are no restrictions preventing your emails from being delivered, such as blocking emails from your domain or IP address.<\/li>\n<\/ul>\n<h3>Resolving SMTP Email Error 517<\/h3>\n<ul>\n<li><strong>Inspect Email Headers.<\/strong>\u00a0Examine the headers of your outgoing emails to ensure they are correctly formatted. This includes verifying that fields like \u2018From\u2019, \u2018To\u2019, and \u2018Subject\u2019 do not contain unusual characters or formatting errors.<\/li>\n<li><strong>Authenticate Your Email.<\/strong>\u00a0Ensure your SMTP settings are correctly configured, especially that you are using the correct username, password, and authentication method required by your email service provider.<\/li>\n<\/ul>\n<h3>General Troubleshooting Steps<\/h3>\n<ol>\n<li>\n<p><strong>Update Email Client.<\/strong>\u00a0Ensure that your email software or application is up-to-date, as updates can fix bugs that may be causing these errors.<\/p>\n<\/li>\n<li>\n<p><strong>Review Email Server Settings.<\/strong>\u00a0For email services like Gmail, Outlook, and Yahoo, ensure you are using the recommended SMTP settings:<\/p>\n<ul>\n<li><strong>Gmail<\/strong>: smtp.gmail.com, SSL required, port 465; or TLS required, port 587.<\/li>\n<li><strong>Outlook<\/strong>: smtp-mail.outlook.com, TLS required, port 587.<\/li>\n<li><strong>Yahoo<\/strong>: smtp.mail.yahoo.com, SSL required, port 465.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Contact Support.<\/strong>\u00a0If the issue persists, contact the support team for your email service provider. They can provide more detailed guidance based on the specifics of your account and their server configurations.<\/p>\n<\/li>\n<\/ol>\n<h2><a href=\"https:\/\/www.warmy.io\/\" target=\"_blank\" rel=\"noopener noreferrer\">Utilizing Email Warm-Up Services<br \/>\n<\/a><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"spam test\" height=\"394\" src=\"https:\/\/warmy-blog-wordpress-bucket.s3.amazonaws.com\/wp-content\/uploads\/2023\/12\/11094332\/spam-test.png\" width=\"550\" title=\"\"><\/p>\n<p>One of the best ways to help you avoid SMTP Email Errors like 513, 515, and 517\u2014which frequently result from deliverability problems\u2014is to use an email warm-up service like <a href=\"https:\/\/www.warmy.io\/\" target=\"_blank\" rel=\"noopener noreferrer\">Warmy.io<\/a>.<\/p>\n<p>Warmy.io is made to improve your reputation for sending emails generally. Warmy contributes to the good sending reputation of new or reset email accounts by progressively boosting the volume of emails sent from them. For new domains or email addresses that have to establish trust and stay out of spam, this procedure is essential.<\/p>\n<p>Warmy.io\u2019s ability to perform extensive <a href=\"https:\/\/www.warmy.io\/free-tools\/email-deliverability-test\" target=\"_blank\" rel=\"noopener noreferrer\">email deliverability tests<\/a> is one of its main advantages. Finding possible problems that can prevent your email from reaching its recipients is made possible in large part by these checks.<\/p>\n<p>Warmy provides you with practical information to help you maximize your email campaigns by examining elements such as recipient engagement, content quality and sender reputation.<\/p>\n<p>Warmy.io also has essential email authentication features. Free record generators are offered for <a href=\"https:\/\/www.warmy.io\/free-tools\/spf-generator\" target=\"_blank\" rel=\"noopener noreferrer\">SPF<\/a> (Sender Policy Framework) and <a href=\"https:\/\/www.warmy.io\/free-tools\/dmarc-generator\" target=\"_blank\" rel=\"noopener noreferrer\">DMARC<\/a> (Domain-based Message Authentication, Reporting &amp; Conformance). The primary cause of emails being rejected or classified as spam by recipient servers is faked emails, which these tools help to confirm are actually coming from your domain.<\/p>\n<p>Warmy.io also provides the chance to speak with an <a href=\"https:\/\/warmy.live\/email-deliverability-consultants?__hstc=232393024.c2a80cab8c3dd9e57611c237ef38229f.1714729852095.1715257064520.1715330769427.16&amp;__hssc=232393024.1.1715330769427&amp;__hsfp=2305378398\" rel=\"noopener\" target=\"_blank\" rel=\"noopener noreferrer\">email deliverability professional<\/a> if you run into recurring problems or require specialized guidance. With the support of these professionals, you can overcome difficult problems and improve your email plan to guarantee maximum deliverability.<\/p>\n<p>You may improve and control your email deliverability proactively by using the features of an email warm-up service such as Warmy.io. This guarantees that your communication stays effective and efficient, reaching your audience uninterrupted, and also helps to avoid SMTP email issues.<\/p>\n<p><iframe width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/tE5-KqNryaQ\" frameborder=\"0\" allowfullscreen allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"><\/iframe><\/p>\n<h2>Conclusion<\/h2>\n<p>Any organization cannot function well without flawless and efficient email communications, which are maintained by resolving SMTP Email Errors 513, 515, and 517. Unresolved, these mistakes can seriously impede your communication flow, affecting anything from internal operations to customer interactions. Through knowledge of the precise reasons and application of the thorough fixes offered for every problem, you can quickly restore functionality and guarantee the dependability of your email system.<\/p>\n<p>Further improving your overall email deliverability is taking a proactive approach to email management, such using an email warm-up service like <a href=\"https:\/\/www.warmy.io\/\" target=\"_blank\" rel=\"noopener noreferrer\">Warmy.io<\/a>. Warmy.io facilitates the important email deliverability testing, the slow development of a good sending reputation, and the optimization of your email settings for best performance. This fortifies your email communications against possible future interruptions in addition to helping to avoid typical SMTP mistakes.<\/p>\n<p>Using Warmy.io\u2019s specialised services and the detailed solutions provided for Gmail, Outlook, Yahoo, and other email services, you may build a strong email infrastructure. This proactive approach guarantees that your company communications stay effective and uninterrupted by addressing SMTP failures right away and strengthening your communications infrastructure against future problems.<\/p>\n<p>\ud83d\udcdc <strong>Related article<\/strong>:<\/p>\n<ul>\n<li><span><a href=\"https:\/\/www.warmy.io\/blog\/how-to-fix-smtp-email-error-471-solved\/\" rel=\"noopener\" target=\"_blank\">SMTP Email Error 471 \u2013 How to Resolve [SOLVED]<\/a><\/span><\/li>\n<li><span><a href=\"https:\/\/www.warmy.io\/blog\/smtp-email-error-441-how-to-resolve-solved\/\" rel=\"noopener\" target=\"_blank\">SMTP Email Error 441 \u2013 How to Resolve [SOLVED]<\/a><\/span><\/li>\n<li><span><a href=\"https:\/\/www.warmy.io\/blog\/how-to-fix-smtp-email-error-511-solved\/\" rel=\"noopener\" target=\"_blank\">SMTP Email Error 511 \u2013 How to Resolve [SOLVED]<\/a><\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Email is still a mainstay of corporate communication in the digital age, supporting everything from everyday operations to major projects. Errors in SMTP (Simple Mail Transfer Protocol) email, however, can interfere with this vital line of communication, causing delays, lost chances, and even harm to reputation. SMTP Email Errors 513, 515, and 517 are especially [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[],"class_list":["post-3888","post","type-post","status-publish","format-standard","hentry","category-email-deliverability"],"acf":[],"lang":"en","translations":{"en":3888,"es":6295},"pll_sync_post":[],"_links":{"self":[{"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/posts\/3888","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/comments?post=3888"}],"version-history":[{"count":1,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/posts\/3888\/revisions"}],"predecessor-version":[{"id":5770,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/posts\/3888\/revisions\/5770"}],"wp:attachment":[{"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/media?parent=3888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/categories?post=3888"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.warmy.io\/blog\/wp-json\/wp\/v2\/tags?post=3888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}