EBS : The Workflow notification mailer is stuck and emails are not going out

Solution:

1. Log into applications as the SYSADMIN user.

2. In the upper right hand corner of the screen, click on Preferences.

3. Within the Notifications section for Email Style, select a valid option other than: Do not send me email or Disabled.

4. Now run the Synchronize WF LOCAL tables Concurrent request.

5. Retest the issue after the Synchronize WF LOCAL tables request is complete.

6. Migrate the solution as appropriate to other environments.

Reference:

Workflow Notifications are Stuck (Doc ID 577234.1)