Send & Receive Issues

How to Fix SharePoint 2019 Email Notifications Not Sending

John Wilson Oct 13, 2026 868 views

Question details

A specific SharePoint 2019 site collection is unable to send email alerts or document-sharing notifications, while other site collections on the same farm work correctly.

How to Fix SharePoint 2019 On-Premises Email Notifications Not Sending

Product: SharePoint Server 2019
Device & OS: not provided
Scenario: Administrators and users are not receiving alerts or sharing notifications from a particular site collection.
Observed behavior: Outgoing emails fail to send from one specific site collection, despite the overall farm outgoing email configurations working for other collections.

Before you start

Ensure you have administrative access to SharePoint Central Administration and the affected site collection, and verify that the target recipients can receive standard external emails.

Solution 1Recommended

Verify Central Administration SMTP and Site Settings

Check the global SMTP configuration and compare the affected site collection settings with a working one to identify configuration discrepancies.

Since other site collections are successfully sending emails, the farm-level SMTP is likely functional, but it is important to verify the configuration and ensure the affected site collection is utilizing valid sender addresses.

Check Outgoing E-mail Settings

Go to SharePoint Central Administration, navigate to System Settings, and click 'Configure outgoing e-mail settings'. Verify the SMTP server address and port.

Verify Site Collection Address

Navigate to the affected site collection settings and verify that the configured sender email address is active, valid, and correctly formatted.

Compare Configurations

Compare the permissions, alert settings, and sender email formats of the affected site collection with a site collection that is sending emails normally to identify differences.

Verify Central Administration SMTP and Site Settings

Recipient Verification: Ensure the recipient email addresses are valid within Active Directory and that users have not accidentally opted out of SharePoint alerts.

Solution 2

Review Spam Filters and SharePoint ULS Logs

Use server logs to find specific error codes and ensure network spam filters aren't blocking the specific site collection's email address.

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Frequently Asked Questions

Why do some SharePoint site collections send emails while others fail?

This usually happens when a specific site collection has a misconfigured 'From' address, lacks appropriate user permissions, or has its custom sender domain blocked by an internal spam filter or Exchange server rule.

Where can I find the SharePoint ULS logs?

SharePoint ULS logs are typically located on the SharePoint Server in the 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\LOGS' directory.

How do I test if my SharePoint SMTP server is working?

You can test the SMTP server connection by using the Telnet client on the SharePoint server to connect to the SMTP port (usually port 25) and manually sending a test email command.

Can a disabled user profile cause SharePoint email alerts to stop?

Yes, if the recipient's user profile in SharePoint is corrupted, outdated, or lacks a valid email address due to synchronization issues with Active Directory, SharePoint will fail to route the alert to that user.

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