In transaction SOST the mails are with error message:
No delivery to XXXXX@abc.com
Message no. XS812
The message was processed correctly in the SAP system. An error occurred in a subsequent system. The message was not delivered to the recipient XXXXX@abc.com.
Information from external system (if available)
503 #5.5.1 RCPT first
XS812, 503 #5.5.1 RCPT first , KBA , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , Problem
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