You have followed SAP note 2326040 - E-mail Notification Alerts for HANA - How To, as well as SAP document Set Up Email Notification Defaults
However, the email recipients failed to receive email notifications when there is a new HANA alert.
Indexserver trace shows below error:
SMTP protocol error, expected 250, got 451: 4.3.0 Multiple destination domains per transaction is unsupported
destination domain, email, alert, SMTP, expected 250, 451: 4.3.0 , KBA , HAN-DB-MON , SAP HANA Monitoring , Problem
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