You are getting below error message (from transaction code SOST) while sending email from SAP system.
From the Long Text, below information is captured,
No delivery to xxx@domain.com as logon data invalid
Message no. XS857
Diagnosis
The message was processed successfully in the SAP system.
The mail server that is to receive the message for further processing demands authentication and registers that the required data is invalid.
Information from external system (if available)
smtp.office365.com:587
535 5.7.3 Authentication unsuccessful [xxxx.prod.outlook.com]
Procedure
Check the security settings on the SAPconnect node.
Solution
Referring to SAP Note 2819033 – No delivery to * as logon data invalid – XS857.
This issue is coming due an issue at mail server level, please ask your mail admin to check the mail server settings.
From ‘RFC 1893 – Enhanced Mail System Status Codes’ the code 5.7.3 means:
- 5.X.X Permanent Failure: A permanent failure is one which is not likely to be resolved by resending the message in the current form. Some change to the message or the destination must be made for successful delivery.
- X.7.3 Security conversion required but not possible. A conversion from one secure messaging protocol to another was required for delivery and such conversion was not possible. This is useful only as a permanent error.
