Exchange 2016 Event ID 1025 MSExchangeTransport / SMTP rejected a (P1) mail from Healthmailboxae

Exchange 2016 Event ID 1025 MSExchangeTransport / SMTP rejected a (P1) mail from Healthmailboxae Again and again I see the error 1025 MSExchangeTransport with Exchange servers, which initially has no major effect. The error is part of the active HealthMonitoring of the Exchange server. The server tries to test the presence of mailboxes and other …