How To Fix XS809 - No delivery to &, as recipient cannot be reached at present

XS809 - Overview

• Message type: E = Error

• Message class: XS - SAPconnect: All messages

• Message number: 809

• Message text: No delivery to &, as recipient cannot be reached at present

What causes this issue?

The message could not be delivered to recipient &V1& as the recipient
cannot be currently reached at this address.

System Response

Processing was ended normally.
Additional information of the node used (in the system language of the
node, if available):
&V4&

How to fix this error?

The system will automatically send the message again. If the message
can still not be delivered after a specified number of attempts, the
recipient list of this message <(>&<)>V1& is flagged as Unreachable.
Check the recipient address. Try sending the message again later.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

XS809 - Details

• The SAP error message XS809, which states "No delivery to &, as recipient cannot be reached at present," typically occurs in the context of SAP's messaging or communication systems, such as SAP Business Workflow or SAP Exchange Infrastructure (XI). This error indicates that the system is unable to deliver a message or notification to a specified recipient due to connectivity issues or configuration problems.
  Causes:
  
  Recipient Unavailability: The recipient (user or system) may be offline or not reachable due to network issues.
  Incorrect Configuration: The recipient's communication settings may be misconfigured, leading to delivery failures.
  System Errors: There may be issues with the SAP system itself, such as service outages or misconfigured services.
  Transport Layer Issues: Problems with the transport layer (e.g., HTTP, SMTP) can prevent messages from being sent.
  User Lock or Deactivation: The recipient user account may be locked or deactivated in the SAP system.
  
  Solutions:
  
  Check Recipient Status: Verify if the recipient is online and