{"id":149457,"date":"2023-09-20T06:23:04","date_gmt":"2023-09-20T06:23:04","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=149457"},"modified":"2025-11-27T05:52:41","modified_gmt":"2025-11-27T05:52:41","slug":"smtp-matching-to-match-on-premises-mailboxes-to-office-365","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/smtp-matching-to-match-on-premises-mailboxes-to-office-365\/","title":{"rendered":"How to Use SMTP Matching to Match On-Premises User Accounts to Office 365?"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>You can easily create a sync between on-premises Exchange Server and Exchange Online (Office 365) to synchronize users, groups, contacts, and other information so that you can simulate a single sign-on with one account and one password with the local setup and the online counterpart. In this context, you can use the <a href=\"https:\/\/learn.microsoft.com\/en-us\/azure\/active-directory\/hybrid\/connect\/how-to-connect-sync-whatis\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Azure Active Directory Sync (AADS)<\/a> when migrating the data and accounts from an on-premises Exchange Server to Exchange Online. You can transfer the authority from the Active Directory Domain Services (AD DS) to the local Active Directory. This can be used to have a synchronization between the local Active Directory and the Exchange Online so that the migration can be a smooth one with minimal impact to the users. This way the users would only need to remember one username, i.e., the email address and one password for their local and cloud account. Below, we will be discussing how to use SMTP matching to match on-premises user accounts to Office 365.<\/p><h2 class=\"wp-block-heading\" id=\"process-to-use-smtp-matching-to-match-on-premises-to-cloud\"><strong>Process to Use SMTP Matching to Match On-Premises to Cloud<\/strong><\/h2><p>Let&rsquo;s start with the SMTP matching process to match the SMTP address at the local setup with the Azure identity that has the same email address. This can then be used to migrate the data accordingly.<\/p><ul class=\"wp-block-list\">\n<li>Sign in to your Office 365 tenant with a global admin.<\/li>\n\n\n\n<li>Click on <strong>Admin<\/strong> and then click on <strong>Show All<\/strong>.<\/li>\n\n\n\n<li>Click on <strong>Exchange,<\/strong> under the <strong>Admin<\/strong> <strong>Centers.<\/strong><\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"185\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/SMTP-matching-process-to-match-the-SMTP-address-at-the-local-setup.png\" alt=\"SMTP matching process to match the SMTP address at the local setup\" class=\"wp-image-149459 apply-gradient-on-post-images\"><\/figure><ul class=\"wp-block-list\">\n<li>Under <strong>Recipients<\/strong>, click on <strong>Mailboxes<\/strong>.<\/li>\n\n\n\n<li>Double-click the user to grant authority.<\/li>\n\n\n\n<li>Click on <strong>Manage<\/strong> <strong>Email<\/strong> <strong>Types<\/strong> and note the primary <strong>SMTP<\/strong> address which is in caps and bold.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"297\" height=\"223\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Manage-Email-Types-for-SMTP-Address.png\" alt=\"Manage Email Types for SMTP Address\" class=\"wp-image-149460 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Manage-Email-Types-for-SMTP-Address.png 297w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Manage-Email-Types-for-SMTP-Address-150x113.png 150w\" sizes=\"auto, (max-width: 297px) 100vw, 297px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>From the <strong>local Active Directory server<\/strong>, <strong>open <\/strong>the <strong>Active Directory Users &amp; Computers<\/strong>.<\/li>\n\n\n\n<li>Create a user same as the online counterpart and set the <strong>SMTP address<\/strong> of the user to match the online identity. It&rsquo;s best to use either the E-mail field or the Attribute Editor in the <strong>Advanced Feature<\/strong>, depending on the user (if it is a new user or an existing one).<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"415\" height=\"390\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/E-mail-field-or-the-Attribute-Editor-in-the-Advanced-Feature.png\" alt=\"E mail field or the Attribute Editor in the Advanced Feature\" class=\"wp-image-149461 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/E-mail-field-or-the-Attribute-Editor-in-the-Advanced-Feature.png 415w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/E-mail-field-or-the-Attribute-Editor-in-the-Advanced-Feature-300x282.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/E-mail-field-or-the-Attribute-Editor-in-the-Advanced-Feature-150x141.png 150w\" sizes=\"auto, (max-width: 415px) 100vw, 415px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>In the Advanced Feature, click on <strong>View<\/strong> and then click on <strong>Advanced<\/strong> <strong>Features<\/strong>.<\/li>\n\n\n\n<li>Now re-open the user and click on the <strong>Attribute<\/strong> <strong>Editor<\/strong> tab.<\/li>\n\n\n\n<li>Scroll-down until you find the attribute <strong>Proxy<\/strong> <strong>Address<\/strong> and click <strong>Edit<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"416\" height=\"274\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/find-the-attribute-Proxy-Address.png\" alt=\"find the attribute Proxy Address\" class=\"wp-image-149462 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/find-the-attribute-Proxy-Address.png 416w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/find-the-attribute-Proxy-Address-300x198.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/find-the-attribute-Proxy-Address-150x99.png 150w\" sizes=\"auto, (max-width: 416px) 100vw, 416px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Make sure that you edit the one with the <strong>SMTP<\/strong> in caps. Then, click <strong>OK<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"370\" height=\"181\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Edit-SMTP.png\" alt=\"Edit SMTP\" class=\"wp-image-149463 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Edit-SMTP.png 370w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Edit-SMTP-300x147.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Edit-SMTP-150x73.png 150w\" sizes=\"auto, (max-width: 370px) 100vw, 370px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>If you have an on-premises Exchange Server, you might need to edit the E-Mail Address Policy so that the user can be reflected with the desired email address to match the one in the Azure Identity.<\/li>\n\n\n\n<li>Now, in the <strong>Azure Active Directory Sync (AADS)<\/strong>, you need to wait for the next scheduled delta synchronization or run this manually using the following command.<\/li>\n<\/ul><p><code>Start-ADSyncSyncCycle -PolicyType Delta<\/code><\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"94\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Start-ADSyncSyncCycle-cmd.png\" alt=\"Start ADSyncSyncCycle cmd\" class=\"wp-image-149464 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Start-ADSyncSyncCycle-cmd.png 385w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Start-ADSyncSyncCycle-cmd-300x73.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/09\/Start-ADSyncSyncCycle-cmd-150x37.png 150w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><\/figure><p>The synchronization process is now complete. The local user and Azure identity should match.<\/p><h2 class=\"wp-block-heading\" id=\"limitations-of-smtp-matching\"><strong>Limitations of SMTP Matching<\/strong><\/h2><p>There are some limitations of the SMTP matching process that might hinder the process at hand. These are:<\/p><ul class=\"wp-block-list\">\n<li>SMTP matching will work for users with an <strong>Exchange Online email address<\/strong>. For matching the <strong>SMTP with contacts<\/strong> and mail-enabled groups, you must make use of the proxy address and it must exist in the Exchange Online environment.<\/li>\n\n\n\n<li>It&rsquo;s important that the <strong>SMTP address<\/strong> of the <strong>Exchange Online resources<\/strong> will not be changed during the <strong>synchronization <\/strong>since it is the only anchor with which the matching can occur between the <strong>on-premises server<\/strong> and the <strong>Azure identity<\/strong>.<\/li>\n\n\n\n<li>It&rsquo;s important to <strong>run <\/strong>a cleanup process and ensure that there are no <strong>duplicate email addresses<\/strong> as this will hinder the <strong>synchronization <\/strong>process.<\/li>\n\n\n\n<li>You cannot just <strong>match <\/strong>and <strong>unmatch <\/strong>the users from the local servers and the cloud identity. When the match is primarily done, it creates a bond between the local user&rsquo;s <strong>GUID <\/strong>and the online user&rsquo;s GUID.<\/li>\n<\/ul><h2 class=\"wp-block-heading\" id=\"to-conclude\">To Conclude<\/h2><p>Sometimes, the process to match on-premises user accounts to Office 365 during a migration can be a little bit tricky. However, issues can arise due to several reasons and system limitations. If you encounter any issues or errors during the SMTP matching, it would hinder the migration process.<\/p><p>For a smooth and quick migration process, you can use specialized <a href=\"https:\/\/www.stellarinfo.com\/exchange-migration.php\">Exchange migration utility<\/a> such as <strong>Stellar Migrator for Exchange<\/strong>. This advanced application helps you migrate primary mailboxes, archives, and public folders seamlessly between <strong>Exchange Server, Office 365 (Microsoft 365), and hosted Exchange<\/strong>. It supports both cross-forest and cross-domain migrations with features like <strong>automatic mailbox mapping, parallel mailbox migration, priority-based transfers, and resume migration<\/strong> in case of interruption ensuring a secure, efficient, and hassle-free migration experience.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can easily create a sync between on-premises Exchange Server and Exchange&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/smtp-matching-to-match-on-premises-mailboxes-to-office-365\/\">Continue reading <span class=\"screen-reader-text\">How to Use SMTP Matching to Match On-Premises User Accounts to Office 365?<\/span><\/a><\/p>\n","protected":false},"author":17,"featured_media":149703,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6204],"tags":[5453,5454],"class_list":["post-149457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange-to-office-365","tag-smtp-matching","tag-sync-on-premises-user-accounts-to-office-365","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Configure SMTP to Match On-Premises User Accounts to Office 365<\/title>\n<meta name=\"description\" content=\"In this blog, we discuss in detail how to use SMTP matching to match on-premises user accounts to Office 365 user accounts for directory synchronization.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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