{"id":1290,"date":"2023-04-11T10:01:10","date_gmt":"2023-04-11T10:01:10","guid":{"rendered":"https:\/\/zonewebsites.us\/blog\/?p=1290"},"modified":"2023-04-11T10:01:10","modified_gmt":"2023-04-11T10:01:10","slug":"smtp-error-could-not-authenticate","status":"publish","type":"post","link":"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/","title":{"rendered":"How To Fix &#8216;smtp error: could not authenticate.&#8217; In PHPMailer?"},"content":{"rendered":"<div style=\"text-align: justify\"><span style=\"font-weight: 400\">Have you recently faced an &#8220;smtp error: could not authenticate&#8221; while using PHPMailer? While this is an effective tool for sending emails easily and safely using SMTP authentication, you may sometimes suffer an error due to incorrect SMTP configuration or incompatible server settings.<\/span><span style=\"font-weight: 400\">&#8220;smtp error: could not authenticate&#8221; is one of the issues that website owners face while sending emails using PHPMailer. There can be many causes for why this error is appearing on your screen. However, worry not; it can be easily resolved with the right steps. Learn<span style=\"color: #000080\"> <a style=\"color: #000080\" href=\"https:\/\/zonewebsites.us\/\"><strong>how to fix &#8216;smtp error: could not authenticate<\/strong><\/a><\/span>.&#8217; in this post.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_47 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\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"ez-toc-toggle-icon-1\"><label for=\"item-6adbb4c3d37c5\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-6adbb4c3d37c5\"><\/a><\/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:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#What_Is_smtp_error_could_not_authenticate\" title=\"What Is smtp error: could not authenticate.?\">What Is smtp error: could not authenticate.?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#How_To_Fix_%E2%80%98smtp_error_could_not_authenticate%E2%80%99_Causes_With_Solutions\" title=\"How To Fix &#8216;smtp error: could not authenticate.&#8217;? Causes With Solutions\">How To Fix &#8216;smtp error: could not authenticate.&#8217;? Causes With Solutions<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#1_Incorrect_SMTP_Authentication_Details\" title=\"1. Incorrect SMTP Authentication Details\">1. Incorrect SMTP Authentication Details<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Solution_For_Incorrect_SMTP_Authentication_Details\" title=\"Solution For Incorrect SMTP Authentication Details\">Solution For Incorrect SMTP Authentication Details<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#2_Incorrect_SMTP_Host_And_SMTP_Port\" title=\"2. Incorrect SMTP Host And SMTP Port\">2. Incorrect SMTP Host And SMTP Port<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Solution_For_Incorrect_SMTP_Host_And_SMTP_Port\" title=\"Solution For Incorrect SMTP Host And SMTP Port\">Solution For Incorrect SMTP Host And SMTP Port<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#3_SMTP_Encryption_Settings\" title=\"3. SMTP Encryption Settings\">3. SMTP Encryption Settings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Solution_For_SMTP_Encryption_Settings\" title=\"Solution For SMTP Encryption Settings\">Solution For SMTP Encryption Settings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#4_Google_Blocking_Insecure_Access\" title=\"4. Google Blocking Insecure Access\">4. Google Blocking Insecure Access<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Solution_For_Google_Blocking_Insecure_Access\" title=\"Solution For Google Blocking Insecure Access\">Solution For Google Blocking Insecure Access<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#5_Expired_Password\" title=\"5. Expired Password\">5. Expired Password<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Solution_For_Expired_Password\" title=\"Solution For Expired Password\">Solution For Expired Password<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/zonewebsites.us\/blog\/smtp-error-could-not-authenticate\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"font-size: 22px\"><span class=\"ez-toc-section\" id=\"What_Is_smtp_error_could_not_authenticate\"><\/span><b>What Is smtp error: could not authenticate.?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\">&#8220;smtp error: could not authenticate.&#8221; is a type of error that indicates that the client couldn&#8217;t authenticate with the email server. There are several reasons why this error occurs, including:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The user didn&#8217;t enter the right credential while logging in; invalid username and password.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The user failed to verify while enabling the multi-factor authentication mechanisms, the Unsupported authentication method.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You didn&#8217;t have the proper SMTP settings configured; your account is disabled.<\/span><\/li>\n<\/ul>\n<h2 style=\"font-size: 22px\"><span class=\"ez-toc-section\" id=\"How_To_Fix_%E2%80%98smtp_error_could_not_authenticate%E2%80%99_Causes_With_Solutions\"><\/span><b>How To Fix &#8216;smtp error: could not authenticate.&#8217;? Causes With Solutions<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\">Now, after knowing the reasons for the &#8216;smtp error: could not authenticate.&#8217; error, you will want to know how to fix it. Well, as there are various causes, let&#8217;s learn about each with their solutions.\u00a0\u00a0\u00a0<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"1_Incorrect_SMTP_Authentication_Details\"><\/span><b>1. Incorrect SMTP Authentication Details<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Regardless of what mail server you use, there is an authentication system to it that validates users to allow them to connect and send emails.<\/span><span style=\"font-weight: 400\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">Whenever you forward or send an email from the script, the mail server tries to confirm the user&#8217;s identity by checking the account username as well as password.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Suppose this authentication gets failed by the mail server. In that case, the mail server will not allow the connection, and users get the &#8220;smtp error: could not authenticate&#8221; error.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"Solution_For_Incorrect_SMTP_Authentication_Details\"><\/span><b>Solution For Incorrect SMTP Authentication Details<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">You can easily solve this cause of error by ensuring that the username and password you have entered are valid. This way, you&#8217;ll know the right username and password are delivered in the mail script.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you have a case of default email accounts, make sure to provide the full username in the application.<\/span><\/p>\n<p><span style=\"font-weight: 400\">In addition, if you have recently changed your password, ensure to update it in the email application.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"2_Incorrect_SMTP_Host_And_SMTP_Port\"><\/span><b>2. Incorrect SMTP Host And SMTP Port<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">It is important that you enter mail server credentials in the &#8220;$mail\u2013&gt;Host&#8221; part of the email application.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If we take an example, suppose you are the user of Gmail as the mail server. In that case, your hostname has to be &#8220;smtp.gmail.com.&#8221; You&#8217;ll usually face such an error when you type in your hostname. Furthermore, you can also suffer this error if there is an inactive mail server.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Now, talking about the port number, generally, the default SMTP port no. is 25. However, there are a few mail servers that use custom ports, like 587, in order to prevent spam. In addition, some mail servers are configured in such a way that they only allow emails through SSL port 465.<\/span><\/p>\n<p><span style=\"font-weight: 400\">There is also a possibility that some providers will restrict access to the SMTP port by following firewall rules. So, you may have email delivery errors due to firewall restrictions or wrong input of port entry in SMTP settings.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"Solution_For_Incorrect_SMTP_Host_And_SMTP_Port\"><\/span><b>Solution For Incorrect SMTP Host And SMTP Port<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Firstly, to solve this error, make sure to confirm the DNS connectivity of your mail server. To do this, write in the command &#8220;dig mail.domain.com.&#8221;<\/span><\/p>\n<p><span style=\"font-weight: 400\">Next, to verify the connectivity to your SMTP port and check the right SMTP port, you have to write the following command: &#8220;telnet domain.com 25.&#8221;<\/span><\/p>\n<p><span style=\"font-weight: 400\">After that, make sure to confirm if you have the correct SMTP settings in the application. In addition, verify that you&#8217;re using the proper SMTP host and port. Furthermore, if there are firewall restrictions, your IP has to be whitelisted in the firewall.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"3_SMTP_Encryption_Settings\"><\/span><b>3. SMTP Encryption Settings<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Well, since security is such a major concern, it&#8217;s obvious that most users prefer using SMTP with encryption for secure email transmission. But, you must know there are two encryption protocols: SSL and TLS.<\/span><\/p>\n<p><span style=\"font-weight: 400\">However, there are a few mail servers where the support for SSL\/TLS might not be active. Furthermore, chances are your current SSL certificate might be expired. And, in such cases, if you specify encryption in your application, you&#8217;ll face the &#8220;<span style=\"color: #000080\"><strong><a style=\"color: #000080\" href=\"https:\/\/zonewebsites.us\/services\">smtp error: could not authenticate<\/a><\/strong><\/span>&#8221; error.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"Solution_For_SMTP_Encryption_Settings\"><\/span><b>Solution For SMTP Encryption Settings<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Firstly, to solve this error due to SMTP encryption settings, you need to ensure that PHP and Apache are correctly configured on your server. You can check this using commands like &#8220;openssl&#8221; and &#8220;mod_ssl,&#8221; which help with SSL working on the server.<\/span><\/p>\n<p><span style=\"font-weight: 400\">In addition, you have to confirm the validity of the SSL certificate of the mail server by using the following command:<\/span><\/p>\n<p><span style=\"font-weight: 400\">\u201copenssl s_client -connect mail.example.com:25 -starttls smtp\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400\">So, ultimately to get rid of this error, you can either remove the SMTP settings encryption or correctly configure SSL for the server.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"4_Google_Blocking_Insecure_Access\"><\/span><b>4. Google Blocking Insecure Access<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">Another possibility of you facing the &#8220;smtp error: could not authenticate&#8221; error is because of the strict security restrictions which Gmail enforces.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Suppose the application you&#8217;re using doesn&#8217;t meet the security standards of Gmail. In that case, it may block your access, as these apps are pretty vulnerable to breaking into.<\/span><\/p>\n<p><span style=\"font-weight: 400\">The reason why you&#8217;ll receive this error is that Google sees your username and password as insecure.\u00a0<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"Solution_For_Google_Blocking_Insecure_Access\"><\/span><b>Solution For Google Blocking Insecure Access<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">If the blocking by Google is your source of error, the first thing you have to do is reconfigure your app, as it will help in meeting the security standards of Google. However, if this method doesn&#8217;t work, you can use the following steps to decrease these security restrictions:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Firstly, sign in to your Google admin console.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Then, head to the &#8220;Security&#8221; section.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">After that, select the &#8220;Basic settings&#8221; option.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Next, head to the &#8220;Less Secure Apps&#8221; section.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Finally, hit the &#8220;Allow less secure apps&#8221; button.<\/span><\/li>\n<\/ul>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"5_Expired_Password\"><\/span><b>5. Expired Password<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">While this is not common, you may face an expired password situation. There are a few servers that come with an auto-expire password setting. And normally, the app maintainers forget about updating their passwords in time.<\/span><\/p>\n<p><span style=\"font-weight: 400\">So, in such cases, when the app tries to connect, the mail server cannot validate the password. And thus, you face an &#8220;<strong><span style=\"color: #000080\"><a style=\"color: #000080\" href=\"https:\/\/zonewebsites.us\/\">smtp error: could not authenticate<\/a><\/span><\/strong>&#8221; error.<\/span><\/p>\n<h3 style=\"font-size: 20px\"><span class=\"ez-toc-section\" id=\"Solution_For_Expired_Password\"><\/span><b>Solution For Expired Password<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400\">You can face this kind of error if you somehow miss the notification telling you about the password expiry. However, the solution is quite simple.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If an expired password is the source of the error, simply reset your password. In addition, make sure to update the new password in the email application.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Other than that, confirm if the notification email is set properly. Furthermore, if you want, you can get rid of the password expiration set for your mailbox.<\/span><\/p>\n<h2 style=\"font-size: 22px\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><b>Conclusion<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400\">&#8220;smtp error: could not authenticate&#8221; is usually faced by individuals who send emails through PHPMailer while using SMTP authentication. A user will face this error if the mail application cannot establish an STMP connection while sending mail via the mail server. So, now after knowing the usual causes and solutions of this error, we hope you can send emails without facing any errors.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you want to make your business visible on Google and looking for more leads and traffic, contact <span style=\"color: #000080\"><strong>ZoneWebsites<\/strong><\/span> at <\/span><span style=\"color: #000080\"><b>+1 866-791-6891<\/b><\/span><span style=\"font-weight: 400\"> or <\/span><a href=\"mailto:info@zonewebsites.us\"><b><span style=\"color: #000080\">info@zonewebsites.us<\/span><\/b><\/a><span style=\"font-weight: 400\"> for the best online marketing services.<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Have you recently faced an &#8220;smtp error: could not authenticate&#8221; while using PHPMailer? While this is an effective tool for sending emails easily and safely using SMTP authentication, you may sometimes suffer an error due to incorrect SMTP configuration or incompatible server settings.&#8220;smtp error: could not authenticate&#8221; is one of the issues that website owners [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[205,204],"class_list":["post-1290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-development","tag-smtp-error","tag-smtp-error-could-not-authenticate"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How To Fix &#039;smtp error: could not authenticate.&#039; In PHPMailer?<\/title>\n<meta name=\"description\" content=\"If you want to fix the \u201csmtp error: could not authenticate,\u201d ensure to use the right username and password. 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