{"id":245754,"date":"2022-03-28T11:37:09","date_gmt":"2022-03-28T18:37:09","guid":{"rendered":"https:\/\/www.quixtec.com\/?p=245754"},"modified":"2022-09-16T11:30:22","modified_gmt":"2022-09-16T18:30:22","slug":"mx-record-ttl-support-policy","status":"publish","type":"post","link":"https:\/\/www.quixtec.com\/blog\/mx-record-ttl-support-policy\/","title":{"rendered":"MX Record TTL Support Policy"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Exchange Online, Microsoft 365 Experts, SharePoint Development<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">From Microsoft Corporation<br>Technical Bulletin MX Record TTL Support Policy<\/p>\n\n\n\n<p class=\"has-vivid-red-color has-text-color wp-block-paragraph\">Action Required by May 2, 2022<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Message Summary<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">We&#8217;re announcing a support policy update to the Time To Live (TTL) value for MX records pointing to Exchange Online and Exchange Online Protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Starting May 2nd, the maximum supported TTL value for MX records will be 6 hours (21,600 seconds) or less for MX records corresponding to domains using Office 365 for email hosting.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Exchange Online recommends setting the TTL values to 1 hour (3,600 seconds) but will support values up to 6 hours (21,600 seconds).<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This will help your organization fully benefit from the high availability of Exchange Online by ensuring that email for your organization is sent to the optimal endpoint in the Exchange Online infrastructure, and it requires some actions on your part.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note<\/strong>: TTLs are measured in seconds and are used to set the length of time a DNS record is cached by a DNS server or client. The greater the TTL value, the longer the record is cached. When a TTL is too long, it can lead to \u2018stale\u2019 records or stale information in the DNS server\u2019s cache. This happens when a DNS record is changed, but the unchanged version of the record is still cached in another DNS server. If the unchanged version of the record is used, it can result in traffic being sent to the wrong destination.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How this will affect your organization:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For all MX records corresponding to domains that use Office 365 for email hosting (e.g. vanity domains, accepted domains), you need to ensure that the MX record TTL value is configured for a maximum of 6 hours (21,600 seconds) or less. Performing this action before May 2nd will ensure that organizations, that send email to you, have significantly less issues with stale records and will connect to the best endpoint for reaching your organization.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What you need to do to prepare:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>If you host your own DNS records:<\/em><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Engage the team managing your DNS Records<\/li><li>For each Record with Type \u2018MX\u2019 that is used for routing mail traffic to Exchange Online<ul><li>Ensure the record is pointing to your organization\u2019s Fully Qualified Domain Name (FQDN) for Exchange Online in the mail.protection.outlook.com domain. For example, for the vanity domain contoso.com, the MX record should be: contoso-com.mail.protection.outlook.com.<\/li><li>Check if the TTL value is 21,600 or less \u2013 if it isn&#8217;t, update the TTL to 21,600 or less. We recommend 3,600 for the best experience.<\/li><\/ul><\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><em>If you use a DNS record provider (ex. GoDaddy):<\/em><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Go to the registrar where you have purchased your domain. (You may need to contact the technical support of the registrar where you have purchased your domain for assistance in changing the MX Record.)<\/li><li>For each Record with Type \u2018MX\u2019 that is used for routing mail traffic to Exchange Online:<ul><li>Ensure the record is pointing to your organization\u2019s FQDN for Exchange Online in the mail.protection.outlook.com domain. For example, for the vanity domain contoso.com, the MX record should be: contoso-com.mail.protection.outlook.com.<\/li><li>Check if the TTL value is 21,600 or less, if it isn&#8217;t, update the TTL to 21,600 or less. We recommend 3,600 for the best experience.<\/li><\/ul><\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Learn more:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/docs.microsoft.com\/microsoft-365\/admin\/get-help-with-domains\/create-dns-records-at-any-dns-hosting-provider?view=o365-worldwide\" target=\"_blank\" rel=\"noreferrer noopener\">Add DNS records to connect your domain<\/a><\/li><li><a href=\"https:\/\/docs.microsoft.com\/exchange\/mail-flow-best-practices\/mail-flow-best-practices\" target=\"_blank\" rel=\"noreferrer noopener\">Mail flow best practices for Exchange Online, Microsoft 365, and Office 365 (overview)<\/a><\/li><li><a href=\"https:\/\/docs.microsoft.com\/exchange\/troubleshoot\/email-delivery\/wrong-office-365-region-exo\" target=\"_blank\" rel=\"noreferrer noopener\">ATTR35 response code when mail is sent to EOP\/EXO<\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exchange Online, Microsoft 365 Experts, SharePoint Development From Microsoft CorporationTechnical Bulletin MX Record TTL Support Policy Action Required by May 2, 2022 Message Summary We&#8217;re announcing a support policy update to the Time To Live (TTL) value for MX records pointing to Exchange Online and Exchange Online Protection. Starting May 2nd, the maximum supported TTL [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":242027,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[29],"tags":[6,12,27],"class_list":["post-245754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange-online","tag-action-required","tag-admin-impact","tag-major-update"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MX Record TTL Support Policy - QuixTec, LLC<\/title>\n<meta name=\"description\" content=\"Exchange Online: Microsoft 365 Experts: SharePoint Development: ACTION REQUIRED: Major Update: MX Record TTL Support Policy: We&#039;re announcing\" \/>\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.quixtec.com\/blog\/mx-record-ttl-support-policy\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MX Record TTL Support Policy - 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