Troubleshooting Email Notification FailuresIssue The email notification fails to trigger for the recipient due to various factors. Below, the causes and resolutions are outlined to check why the notification failed to trigger.Cause"Cmn_notif_message.LIST" Table for Primary email enabled for notification or not The "cmn_notif_message" table serves as a repository for all email subscriptions within the instance. Distinct records are generated for each user if multiple users subscribe to the same email notification. Search the user and the notification to see whether primary email is enabled for the recipient or not "Cmn_notif_dev.LIST" table to check user's email address When a user's email address is updated in the "sys_user" table, the "update email devices" business rule is triggered, updating the corresponding email address in the "cmn_notif_dev" table. The primary address listed in the "cmn_notif_dev" table is utilized for sending notifications.Examine Business Rules: Check for any business rules on the associated target table that may contain "setWorkflow(false)," which could prevent email triggering. Review Email Configuration: Navigate to email properties and ensure that email sending is enabled. Navigate to sys_properties.LIST search for "glide.email.smtp.active" and check the value should be true Determine Notification Type: Depending on whether the notification is event-based or condition-based: For event-based notifications:Access event logs and verify if the relevant event has been triggered.If the event is not triggered, scrutinize the associated business rule for proper conditions and parameter passing via gs.eventqueue method.Verify the triggering event, especially focusing on notification.engine.process0 event. For condition-based notifications:Verify if the conditions specified for triggering the notification are met. NOTE: If the event fails to trigger despite meeting the conditions for the target record during insertion or update, escalate the issue by raising a High support case to ServiceNow Check Recipient's Notification Settings: Impersonate the recipient and click on profile>preferences>notifications>advanced preferences and serach for notificationEnsure that the primary email is enabled for the user Review Notification Conditions: Open the notification, preview the notification, and ensure that the conditions for triggering the notification are satisfied for target record Verify SMTP Email Account: Navigate to email accounts and confirm the SMTP email account is active, created by an admin and of type relay. Email Diagnostics: Review email sending operational status under email diagnostics. Consideration for Email Recipients: Adjust system policy settings if necessary to ensure event creators receive notifications. Group Notifications: For notifications sent to groups, ensure all group members are active and have notification preferences enabled.Navigate to the "cmn_notif_message.LIST" and search with user ID to check the presence of primary email addresses. ResolutionIt is essential to meticulously follow these steps to guarantee the effective configuration and resolution of any issues pertaining to notification.