How To Fix XS855 - No delivery as sender or receiver address is invalid

XS855 - Overview

• Message type: E = Error

• Message class: XS - SAPconnect: All messages

• Message number: 855

• Message text: No delivery as sender or receiver address is invalid

What causes this issue?

The message was processed correctly in the SAP system. However, a
subsequent system has classified the sender or receiver address (or
both) as invalid or unknown and has not delivered the message to the
receiver.
Information from external system (if available)
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How to fix this error?

Check the relevant address.

Error message extract from SAP system. Copyright SAP SE.

XS855 - Details

• The SAP error message XS855, which states "No delivery as sender or receiver address is invalid," typically occurs in the context of SAP's messaging or communication systems, such as when sending emails or messages through the SAP system. This error indicates that either the sender's or receiver's email address is not valid, which prevents the system from processing the delivery.
  Causes:
  
  Invalid Email Address: The sender or receiver email address may be incorrectly formatted (e.g., missing "@" or domain).
  Missing Configuration: The sender's email address may not be configured in the system.
  Inactive User: The user associated with the sender or receiver email address may be inactive or not properly set up in the SAP system.
  System 
  Configuration Issues: There may be issues with the configuration of the SMTP server or other communication settings in the SAP system.
  Authorization Issues: The user may not have the necessary authorizations to send messages.
  
  Solutions:
  
  Check Email Addresses: Verify that both