{"id":24047,"date":"2025-09-30T10:55:00","date_gmt":"2025-09-30T10:55:00","guid":{"rendered":"https:\/\/1-grid.com\/knowledge\/outlook-security-certificate-warning\/"},"modified":"2025-09-30T10:56:27","modified_gmt":"2025-09-30T10:56:27","slug":"troubleshooting-a-security-certificate-warning-pop-up-in-outlook","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/","title":{"rendered":"Troubleshooting a Security Certificate Warning Pop-Up in Outlook"},"content":{"rendered":"\n<p>When Outlook issues a security certificate warning as an \u201cInternet Security Warning\u201d pop-up, it\u2019s usually because the server name you&#8217;ve used in your account settings doesn\u2019t match what the SSL certificate is issued for.&nbsp;&nbsp;<\/p>\n\n\n\n<p>It is one of the most common issues experienced when using Outlook with SSL enabled, and happens when you do not have your own SSL certificate installed on your domain for your \u2018mail.yourdomain.com&#8217;.&nbsp;&nbsp;<\/p>\n\n\n\n<p>No need to worry! You can fix a Security Certificate Warning in Outlook in a few simple steps, or you can secure your mail domain with your own <a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL<\/strong><\/a> by purchasing one <a href=\"https:\/\/1-grid.com\/comodo-ssl-certificates\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>here<\/strong><\/a>.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/1-grid-Images-for-KB-Articles-1000-x-600-px-29.png\" alt=\"\" class=\"wp-image-33697\"\/><\/figure>\n\n\n\n<div class=\"wp-block-ht-block-toc is-style-rounded htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Table of Contents<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#htoc-why-does-this-warning-appear\">Why Does This Warning Appear?<\/a><\/li><li class=\"\"><a href=\"#htoc-how-to-inspect-the-certificate\">How to Inspect the Certificate&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-methods-to-resolve-the-mismatch\">Methods to Resolve the Mismatch<\/a><\/li><li class=\"\"><a href=\"#htoc-steps-on-how-to-resolve-this\">Steps on How to Resolve This&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-updating-your-1-grid-email-settings-using-the-server-name\">Updating Your 1-grid Email Settings Using the Server Name&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-cautions-and-security-notes\">Cautions and Security Notes<\/a><\/li><li class=\"\"><a href=\"#htoc-best-practices-for-ssl-and-mail-domains\">Best Practices for SSL and Mail Domains&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-prefer-to-purchase-your-own-ssl\">Prefer to Purchase Your Own SSL?&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-faqs\">FAQs<\/a><\/li><li class=\"\"><a href=\"#htoc-additional-resources\">Additional Resources&nbsp;<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-why-does-this-warning-appear\"><strong>Why Does This Warning Appear?<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-ssl-certificates-validate-that-a-server-is-who-it-claims-to-be\"><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL certificates<\/strong><\/a> validate that a server is who it claims to be.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-if-outlook-connects-to-mail-yourdomain-com-but-the-ssl-certificate-is-for-srv-hostserv-co-za-outlook-sees-that-as-a-mismatch-and-issues-this-warning\">If Outlook connects to mail.yourdomain.com, but the SSL certificate is for srv.hostserv.co.za, Outlook sees that as a mismatch and issues this warning.<\/li>\n\n\n\n<li id=\"htoc-this-protects-you-against-man-in-the-middle-mitm-attacks-but-requires-the-correct-configurations-on-your-side\">This protects you against <strong><a href=\"https:\/\/workos.com\/blog\/mitm-attacks-prevention\" target=\"_blank\" rel=\"noreferrer noopener\">\u201cman-in-the-middle\u201d (MitM)<\/a> <\/strong>attacks but requires the correct configurations on your side.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-how-to-inspect-the-certificate\"><strong>How to Inspect the Certificate&nbsp;<\/strong><\/h2>\n\n\n\n<p>1. In the warning pop-up, click <strong>View Certificate<\/strong>.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"716\" height=\"410\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-43.png\" alt=\"\" class=\"wp-image-33699\" style=\"width:353px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p>2. Look at the \u201cIssued to\u201d field, as this is where the domain or server name for which the certificate is valid for.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"469\" height=\"368\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-80.png\" alt=\"\" class=\"wp-image-33700\" style=\"width:362px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p>3. Note any mismatch between that name and what you used in your Outlook settings.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-methods-to-resolve-the-mismatch\"><strong>Methods to Resolve the Mismatch<\/strong><\/h2>\n\n\n\n<p>Here\u2019s three options you can use to resolve it:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>The Methods<\/strong>&nbsp;<\/td><td><strong>What to Do<\/strong>&nbsp;<\/td><td><strong>When to Use<\/strong>&nbsp;<\/td><\/tr><tr><td><strong>Install a proper SSL for your mail domain<\/strong>&nbsp;<\/td><td>Acquire and install an SSL for mail.yourdomain.com&nbsp;<\/td><td>If you own the domain and can install SSL&nbsp;<\/td><\/tr><tr><td><strong>Use the server\/hostname shown in the certificate<\/strong>&nbsp;<\/td><td>Update your Outlook server name to match the certificate (e.g. srv.hostserv.co.za)&nbsp;<\/td><td>Works when you trust the certificate\u2019s hostname&nbsp;<\/td><\/tr><tr><td><strong>Use the corresponding IP address<\/strong>&nbsp;<\/td><td>Ping the hostname in the certificate, and use that IP in the Outlook settings&nbsp;<\/td><td>Ping the hostname in the certificate, use that IP in the Outlook settings&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>IMPORTANT: <\/strong>After making the change, restart your Outlook and test sending\/receiving.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-steps-on-how-to-resolve-this\"><strong>Steps on How to Resolve This&nbsp;<\/strong><\/h2>\n\n\n\n<p>1. Click on <strong>View Certificate<\/strong>.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"716\" height=\"410\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-43.png\" alt=\"\" class=\"wp-image-33699\" style=\"width:363px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p>2. Take note of the \u201c<strong>Issued to<\/strong>\u201d field, and then click <strong>Install Certificate<\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"485\" height=\"542\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-44.png\" alt=\"\" class=\"wp-image-33698\" style=\"width:369px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><strong>TIP: <\/strong>You need to choose to install the certificate or use the server\u2019s IP address or server name instead of using&nbsp;mail.yourdomain.com&nbsp;in your Outlook settings.<\/p>\n\n\n\n<p>3. Get the mail server&#8217;s <strong>IP address<\/strong> and the<strong> server<\/strong> that the mail is hosted on.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-type-cmd-on-the-start-menu-to-open-a-command-prompt\">Type&nbsp;<strong>cmd&nbsp;<\/strong>in the Search bar to open a Command Prompt.&nbsp;<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"730\" height=\"595\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-45-1.png\" alt=\"\" class=\"wp-image-33706\" style=\"width:417px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-type-ping-srv-hostserv-co-za-to-find-your-ip-address-and-the-host-s-server-name\">Type&nbsp;<strong>ping<\/strong>, then a<strong> space<\/strong>, then type in your <strong>mail.yourdomain.com<\/strong>, and press <strong>Enter<\/strong>. This will find your IP address for your mail.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1031\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-46-1.png\" alt=\"\" class=\"wp-image-33709\" style=\"width:555px;height:auto\"\/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1033\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-48-1.png\" alt=\"\" class=\"wp-image-33708\" style=\"width:558px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-\">Then, do a <strong>reverse ping <\/strong>using the <strong>IP address<\/strong> to find the server name that your mail is hosted on.\n<ul class=\"wp-block-list\">\n<li id=\"htoc-1\">Type <strong>ping<\/strong>, a <strong>space<\/strong>, and then type <strong>-a<\/strong> with another<strong> space<\/strong>. Then, <strong>copy<\/strong> your <strong>IP address<\/strong> and <strong>paste<\/strong> it, then press <strong>Enter<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/Copy-of-1-grid-Images-for-KB-Articles-1000-x-600-px-49-1.png\" alt=\"\" class=\"wp-image-33707\" style=\"width:561px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-if-the-server-name-in-the-ping-results-matches-the-name-on-the-certificate-use-it-as-the-mail-server-name-in-outlook\">If the server name in the ping results matches the name on the certificate, use it as the mail server name in Outlook.<\/li>\n\n\n\n<li id=\"htoc-if-the-name-is-different-ping-the-server-name-used-in-the-certificate-if-the-ip-address-matches-your-mail-server-s-ip-address-use-it-as-the-mail-server-name-in-outlook\">If the name is different, ping the server name used in the certificate. If the IP address matches your mail server\u2019s IP address, use it as the mail server name in Outlook.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-updating-your-1-grid-email-settings-using-the-server-name\"><strong>Updating Your 1-grid Email Settings Using the Server Name&nbsp;<\/strong><\/h2>\n\n\n\n<p>Once you have identified the server\u2019s name or IP address, you can quickly and easily <a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>re-configure your 1-grid email accounts through your Email Client<\/strong><\/a>.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-cautions-and-security-notes\"><strong><strong>Cautions and Security Notes<\/strong><\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-only-accept-certificates-that-you-trust-validate-the-issued-to-and-certificate-chain\">Only accept certificates that you trust (validate the \u201cIssued to\u201d and certificate chain).&nbsp;<\/li>\n\n\n\n<li id=\"htoc-avoid-using-insecure-or-non-ssl-connections\">Avoid using insecure or non-SSL connections.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-don-t-ignore-warnings-where-possible-as-that-compromises-the-security-of-your-account\">Don\u2019t ignore warnings, where possible, as that compromises the security of your account.<\/li>\n\n\n\n<li id=\"htoc-if-you-switch-to-ip-based-settings-certificate-renewals-or-changes-may-require-you-to-update-your-settings-again\">If you switch to IP-based settings, certificate renewals or changes may require you to update your settings again.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-best-practices-for-ssl-and-mail-domains\"><strong><strong><strong>Best Practices for SSL and Mail Domains&nbsp;<\/strong><\/strong><\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-use-ssl-secure-sockets-layer-and-tls-transport-layer-security-protocols-for-all-email-traffic-incoming-amp-outgoing\">Use <strong><a href=\"https:\/\/www.cloudflare.com\/learning\/ssl\/what-is-ssl\/\">SSL (Secure Sockets Layer)<\/a>&nbsp;<\/strong>and&nbsp;<a href=\"https:\/\/www.cloudflare.com\/learning\/ssl\/transport-layer-security-tls\/\"><strong>TLS (Transport Layer Security)<\/strong><\/a>&nbsp;protocols for all email traffic (incoming &amp; outgoing).&nbsp;<\/li>\n\n\n\n<li id=\"htoc-get-a-valid-ssl-that-matches-your-mail-domain-mail-yourdomain-com-rather-than-relying-on-generic-server-names\">Get a valid <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\">SSL<\/a> <\/strong>that matches your mail domain (mail.yourdomain.com) rather than relying on generic server names.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-regularly-renew-and-keep-ssl-certificates-updated\">Regularly renew and keep SSL certificates updated.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-after-installing-an-ssl-clear-any-cached-certificates-in-outlook-or-windows-certificate-store-before-retrying\">After installing an <a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL<\/strong><\/a>, clear any cached certificates in Outlook (or Windows Certificate store) before retrying.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-prefer-to-purchase-your-own-ssl\"><strong><strong><strong><strong>Prefer to Purchase Your Own SSL?&nbsp;<\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p>We partner with leading SSL providers, <a href=\"https:\/\/1grid.co.za\/website-security\/ssl\/comodo\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Sectigo<\/strong><\/a> and <a href=\"https:\/\/1grid.co.za\/website-security\/ssl\/thawte\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Thawte<\/strong><\/a>, to keep your website secure. Choosing the right certificate is about matching protection to your business needs, and we\u2019ll help you find the option that fits best.&nbsp;<br>&nbsp;<br>Once you have <a href=\"https:\/\/1grid.co.za\/website-security\/ssl\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>purchased your SSL<\/strong><\/a>, you can <a href=\"https:\/\/1grid.co.za\/knowledge\/?s=install+SSL&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>install it<\/strong><\/a>. If you get stuck, you can reach out to our Support Team for some assistance in completing the process so that you can continue with re-configuring your settings. &nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-faqs\"><strong><strong><strong><strong><strong>FAQs<\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Is it safe to click \u201cInstall Certificate\u201d when prompted?<\/strong><\/summary>\n<p id=\"htoc-only-if-the-certificate-matches-your-server-or-domain-always-inspect-the-issued-to-section-before-trusting\">Only if the certificate matches your server or domain. Always inspect the \u201cIssued to\u201d section before trusting.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>The certificate \u201cIssued to\u201d is a server hostname I don\u2019t recognise. What should I use?<\/strong><\/summary>\n<p id=\"htoc-if-you-trust-your-provider-use-that-hostname-in-outlook-if-not-consider-installing-a-matching-ssl-for-your-domain\">If you trust your provider, use that hostname in Outlook. If not, consider installing a matching SSL for your domain.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>After switching to an IP instead of a hostname, do I need to change anything later?<\/strong><\/summary>\n<p id=\"htoc-possibly-if-your-server-ip-changes-or-the-ssl-certificate-updates-you-may-need-to-update-the-settings-again\">Possibly. If your server IP changes or the SSL certificate updates, you may need to update the settings again.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Why doesn\u2019t this affect Webmail?<\/strong><\/summary>\n<p id=\"htoc-webmail-usually-uses-the-correct-hostname-ssl-by-default-unlike-manual-outlook-settings-which-rely-on-what-you-entered\">Webmail usually uses the correct hostname\/SSL by default, unlike manual Outlook settings, which rely on what you entered.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Outlook shows \u201cunable to verify server identity\u201d. What do I do?<\/strong><\/summary>\n<p id=\"htoc-verify-that-the-hostname-in-your-settings-matches-the-certificate-you-may-need-to-accept-the-certificate-if-valid-you-can-also-troubleshoot-this-error\">Verify that the hostname in your settings matches the certificate. You may need to accept the certificate if valid. You can also<strong> <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-fix-cannot-verify-server-identity-error\/\" target=\"_blank\" rel=\"noreferrer noopener\">troubleshoot this error<\/a><\/strong>.<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-additional-resources\"><strong><strong><strong><strong><strong><strong>Additional Resources&nbsp;<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Settings to Configure Your 1-grid Email Accounts Across Devices<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/setting-up-email-in-outlook-via-windows-control-panel\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Setting Up Email in Outlook via Windows Control Panel<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=Outlook&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Outlook FAQs<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=email+setup&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Email Setup How-Tos<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-steps-for-email\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Troubleshooting Steps for Email<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/top-10-common-email-issues\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Top 10 Common Email Issues!<\/strong><\/a><strong>&nbsp;&nbsp;<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>What is an SSL Certificate and Why Do I Need It?<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/ssl-what-type-of-certificate-do-i-need\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>What Type of SSL Certificate Do I Need?<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=SSL&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL FAQs<\/strong><\/a><strong> &nbsp;<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=spamtitan&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SpamTitan FAQs<\/strong><\/a>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=mailchannels&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>MailChannels FAQs<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-need-additional-support\"><strong>Need Additional Support?&nbsp;<\/strong><\/h2>\n\n\n\n<p><strong>We&#8217;re Here to <\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Help<\/strong><\/a><strong>:<\/strong>&nbsp;<br><br>Resolving a Security Certificate Warning in Outlook doesn\u2019t have to feel tricky with this easy-to-use guide. Stuck? Contact our Support Team for guidance (<a href=\"https:\/\/1grid.co.za\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>https:\/\/1grid.co.za\/contact-us\/<\/strong><\/a>). We&#8217;re ready to see how we can help!&nbsp;<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When Outlook issues a security certificate warning as an \u201cInternet Security Warning\u201d pop-up, it\u2019s usually because the server name you&#8217;ve used in your account settings doesn\u2019t match what the SSL certificate is issued for.&nbsp;&nbsp; It is one of the most common issues experienced when using Outlook with SSL enabled, and&#8230;<\/p>\n","protected":false},"author":21,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"ht-kb-category":[1173,1193,1194],"ht-kb-tag":[179,336,344,470,709,891,950,1046,1104],"class_list":["post-24047","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_category-email-setup-config","ht_kb_category-email-troubleshooting","ht_kb_tag-certificate","ht_kb_tag-email","ht_kb_tag-email-hosting","ht_kb_tag-hosting","ht_kb_tag-outlook","ht_kb_tag-security","ht_kb_tag-ssl","ht_kb_tag-troubleshooting","ht_kb_tag-warning"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base\" \/>\n<meta property=\"og:description\" content=\"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\" \/>\n<meta property=\"og:site_name\" content=\"1-grid Knowledge Base\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/1grid.co.za\/\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-30T10:56:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/1-grid-Images-for-KB-Articles-1000-x-600-px-29.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@1grid_hosting\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\",\"url\":\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\",\"name\":\"Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base\",\"isPartOf\":{\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#website\"},\"datePublished\":\"2025-09-30T10:55:00+00:00\",\"dateModified\":\"2025-09-30T10:56:27+00:00\",\"description\":\"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.\",\"breadcrumb\":{\"@id\":\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/1grid.co.za\/knowledge\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Troubleshooting a Security Certificate Warning Pop-Up in Outlook\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#website\",\"url\":\"https:\/\/1grid.co.za\/knowledge\/\",\"name\":\"1-Grid Domain Hosting Knowledge Base\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/1grid.co.za\/knowledge\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#organization\",\"name\":\"1-Grid Domain Hosting Knowledge Base\",\"url\":\"https:\/\/1grid.co.za\/knowledge\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2023\/01\/1-grid-logo-color.svg\",\"contentUrl\":\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2023\/01\/1-grid-logo-color.svg\",\"width\":100,\"height\":100,\"caption\":\"1-Grid Domain Hosting Knowledge Base\"},\"image\":{\"@id\":\"https:\/\/1grid.co.za\/knowledge\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/1grid.co.za\/\",\"https:\/\/twitter.com\/1grid_hosting\",\"https:\/\/www.instagram.com\/1grid_hosting\/\",\"https:\/\/za.linkedin.com\/company\/1-grid\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base","description":"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/","og_locale":"en_US","og_type":"article","og_title":"Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base","og_description":"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.","og_url":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/","og_site_name":"1-grid Knowledge Base","article_publisher":"https:\/\/www.facebook.com\/1grid.co.za\/","article_modified_time":"2025-09-30T10:56:27+00:00","og_image":[{"url":"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/1-grid-Images-for-KB-Articles-1000-x-600-px-29.png"}],"twitter_card":"summary_large_image","twitter_site":"@1grid_hosting","twitter_misc":{"Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/","url":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/","name":"Troubleshooting a Security Certificate Warning Pop-Up in Outlook - 1-grid Knowledge Base","isPartOf":{"@id":"https:\/\/1grid.co.za\/knowledge\/#website"},"datePublished":"2025-09-30T10:55:00+00:00","dateModified":"2025-09-30T10:56:27+00:00","description":"Learn how to resolve a Security Certificate Warning pop-up in Outlook in a few simple steps, and how to secure your emails with an SSL.","breadcrumb":{"@id":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/1grid.co.za\/knowledge\/"},{"@type":"ListItem","position":2,"name":"Troubleshooting a Security Certificate Warning Pop-Up in Outlook"}]},{"@type":"WebSite","@id":"https:\/\/1grid.co.za\/knowledge\/#website","url":"https:\/\/1grid.co.za\/knowledge\/","name":"1-Grid Domain Hosting Knowledge Base","description":"","publisher":{"@id":"https:\/\/1grid.co.za\/knowledge\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/1grid.co.za\/knowledge\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/1grid.co.za\/knowledge\/#organization","name":"1-Grid Domain Hosting Knowledge Base","url":"https:\/\/1grid.co.za\/knowledge\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/1grid.co.za\/knowledge\/#\/schema\/logo\/image\/","url":"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2023\/01\/1-grid-logo-color.svg","contentUrl":"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2023\/01\/1-grid-logo-color.svg","width":100,"height":100,"caption":"1-Grid Domain Hosting Knowledge Base"},"image":{"@id":"https:\/\/1grid.co.za\/knowledge\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/1grid.co.za\/","https:\/\/twitter.com\/1grid_hosting","https:\/\/www.instagram.com\/1grid_hosting\/","https:\/\/za.linkedin.com\/company\/1-grid"]}]}},"_links":{"self":[{"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb\/24047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/comments?post=24047"}],"version-history":[{"count":6,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb\/24047\/revisions"}],"predecessor-version":[{"id":33712,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb\/24047\/revisions\/33712"}],"wp:attachment":[{"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/media?parent=24047"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb-category?post=24047"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/1grid.co.za\/knowledge\/wp-json\/wp\/v2\/ht-kb-tag?post=24047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}