How To Fix SO789 - With dead letter recipients no additional selection is possible

SAP Error Message - Details

• Message type: E = Error

• Message class: SO - SAPoffice: message texts

• Message number: 789

• Message text: With dead letter recipients no additional selection is possible

What causes this issue?

Incoming documents are distributed to dead letter recipients if a
receiver was not found. Therefore it is also not possible to send
further documents to this receiver.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SO789 - With dead letter recipients no additional selection is possible ?

  The SAP error message SO789, which states "With dead letter recipients no additional selection is possible," typically occurs in the context of SAP's email or communication services, particularly when dealing with the SAPconnect interface. This error indicates that there are recipients in the "dead letter" queue, which means that messages sent to these recipients have failed and cannot be delivered.
  Cause:
  
  Invalid Email Addresses: The recipients in the dead letter queue may have invalid or incorrectly formatted email addresses.
  Non-existent Recipients: The email addresses may belong to users who no longer exist in the system.
  Mail Server Issues: There could be issues with the mail server configuration or connectivity that prevent successful delivery.
  Blocked or Blacklisted Addresses: The email addresses may be blocked or blacklisted by the mail server.
  
  Solution:
  
  Check Dead Letter Queue: Review the dead letter queue to identify the recipients causing the issue. You can do this using transaction code SOST in SAP.
  Correct Email Addresses: Verify and correct any invalid email addresses. Ensure that the email format is correct and that the recipients exist in the system.
  Remove Invalid Recipients: If certain recipients are no longer valid, consider removing them from the recipient list or updating their email addresses.
  Check Mail Server Configuration: Ensure that the mail server settings in SAP are correctly configured. This includes checking SMTP settings and ensuring that the server is reachable.
  Test Email Sending: After making corrections, try sending a test email to the corrected addresses to ensure that the issue is resolved.
  Consult Logs: If the problem persists, check the application logs for more detailed error messages that can provide further insights into the issue.
  
  Related Information:
  
  Transaction Codes: Use transaction SOST to view the status of sent messages and the dead letter queue.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to email sending and dead letter handling.
  Documentation: Refer to SAP documentation on SAPconnect and email configuration for detailed guidance on setting up and troubleshooting email services.
  
  By following these steps, you should be able to resolve the SO789 error and ensure that emails are sent successfully without encountering dead letter recipients.