The original message was received at Sat, 6 Apr 2024 11:05:15 +0200 from m0316695.ppops.net [127.0.0.1]

----- The following addresses had permanent fatal errors ----- Sandra.Fernandez33@educa.madrid.org (reason: 553 sorry, mail to that recipient is not accepted (#5.7.1))

----- Transcript of session follows ----- ... while talking to [193.146.123.86]:

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<<< 553 sorry, mail to that recipient is not accepted (#5.7.1) 550 5.1.1 Sandra.Fernandez33@educa.madrid.org... User unknown <<< 503 RCPT first (#5.5.1)