2745673 - SAP Cloud Identity Services - "Password Reset" mail does not arrive - invalid recipient email

User tries to reset her/his password using 'forgot password' functionality to receive an activation mail but it never arrives.

In SPLUNK the following entries can be seen:

#INFO#statistics##au0efjgbf#anonymous#http-bio-127.0.0.1-8080-exec-885#na#N/A#N/A#N/A#Email could not be sent to example@example.com with subject How to reset your password. Reason: invalid recipient email. (sp=Administration Console,user_agent=,workflow=sso,checkpoint=account_register_error,uid=P000001)#BC35B57E-7538-4597-A83E-537A8DEF42C0|

SAP Cloud Identity Services

com.sap.ids.usermanagement.exception.IdsMailingInvalidRecipientException, IdsMailingInvalidRecipientException, IDS Mailing Exception, IDS Mailing Invalid Recipient, with subject How to reset your password, invalid recipient email, Sending the email to the following server failed , KBA , BC-IAM-IDS , Identity Authentication Service , Problem