The original message was received at Tue, 25 Jan 2022 12:48:43 +0100 from m0218703.ppops.net [127.0.0.1] ----- The following addresses had permanent fatal errors ----- (reason: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT041.eop-EUR03.prod.protection.outlook.com]) ----- Transcript of session follows ----- ... while talking to elmundo-es.mail.protection.outlook.com.:

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DATA <<< 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT041.eop-EUR03.prod.protection.outlook.com] 550 5.1.1 ... User unknown <<< 503 5.5.2 Need rcpt command [VE1EUR03FT041.eop-EUR03.prod.protection.outlook.com]