In the case you controlled the out sending of your Emails under "all messages" and you see that the system tries several times sending the e-mail out but it was not successful.
The loggings shows the error message "501 5.1.7 Bad sender address syntax".
SAP Event Ticketing (Backend)
Error, 501 5.1.7, Bad, sender, address, syntax, Fehlermeldung, Absender, versenden, alle Nachrichten, versenden, sender, logging, error logs, , KBA , IS-SE-ET , SAP Event Ticketing , Problem
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