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This update was initially released on January 15, 2026 as KB5074819 with SQL Server product version **16.0.4235.2** and file version **2022.160.4235.2**. The initial release of this update contained a [defect](#database-mail-stops-working-after-updating) that caused Database Mail to stop working. The defect is fixed in the currently available version of this cumulative update.
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> [!IMPORTANT]
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> The initial release of this cumulative update (KB5074819) contained an issue that caused Database Mail to stop working. You might also see the following error message:
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>
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> > Could not load file or assembly 'Microsoft.SqlServer.DatabaseMail.XEvents, Version=17.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.
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>
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> This issue affects SQL Server product version **16.0.4235.2** and file version **2022.160.4235.2**.
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>
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> This issue is resolved in the current version of this cumulative update (KB5078297).
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>
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> If you downloaded the initial release of this update, don't install it. Download and install the current version instead.
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>
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> If you already installed the initial release, [uninstall](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) it or install the current version to restore Database Mail functionality.
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>
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> Future cumulative updates also contain the fix for this issue. You can install them regardless of which version of this cumulative update is currently installed.
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>
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> Email messages queued through Database Mail while the initial release was installed aren't automatically resent when you uninstall it or install a cumulative update that contains the fix.
This update was initially released on January 15, 2026 as KB5074901 with SQL Server product version **17.0.4005.7** and file version **2025.170.4005.7**. The initial release of this update contained a [defect](#database-mail-stops-working-after-updating) that caused Database Mail to stop working. The defect is fixed in the currently available version of this cumulative update.
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> [!IMPORTANT]
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> The initial release of this cumulative update (KB5074901) contained an issue that caused Database Mail to stop working. You might also see the following error message:
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>
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> > Could not load file or assembly 'Microsoft.SqlServer.DatabaseMail.XEvents, Version=17.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.
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>
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> This issue affects SQL Server product version **17.0.4005.7** and file version **2025.170.4005.7**.
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>
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> This issue is resolved in the current version of this cumulative update (KB5078298).
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>
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> If you downloaded the initial release of this update, don't install it. Download and install the current version instead.
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>
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> If you already installed the initial release, [uninstall](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) it or install the current version to restore Database Mail functionality.
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>
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> Future cumulative updates also contain the fix for this issue. You can install them regardless of which version of this cumulative update is currently installed.
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+
>
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> Email messages queued through Database Mail while the initial release was installed aren't automatically resent when you uninstall it or install a cumulative update that contains the fix.
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