Mail delivery failed: returning message to sender

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This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
[email protected] host gmail-smtp-in.l.google.com [142.251.9.26] SMTP error from remote mail server after RCPT TO:<[email protected]>: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient’s email address for typos or 550-5.1.1 unnecessary spaces. For more information, go to 550 5.1.1 support.google.com/mail/?p=NoSuchUser a640c23a62f3a-b734fc3c5bdsi477728166b.459 – gsmtp [email protected] host hotmail-com.olc.protection.outlook.com [52.101.68.4] SMTP error from remote mail server after pipelined end of data: 503 5.5.2 Need rcpt command [DB1PEPF0003922E.eurprd03.prod.outlook.com 2025-11-16T04:37:18.691Z 08DE244E7F5CA26B] [email protected] host hotmail-com.olc.protection.outlook.com [52.101.68.4] SMTP error from remote mail server after pipelined end of data: 503 5.5.2 Need rcpt command [DB1PEPF0003922E.eurprd03.prod.outlook.com 2025-11-16T04:37:18.691Z 08DE244E7F5CA26B] [email protected] host hotmail-com.olc.protection.outlook.com [52.101.68.4] SMTP error from remote mail server after pipelined end of data: 503 5.5.2 Need rcpt command [DB1PEPF0003922E.eurprd03.prod.outlook.com 2025-11-16T04:37:18.691Z 08DE244E7F5CA26B] [email protected] host hotmail-com.olc.protection.outlook.com [52.101.68.4] SMTP error from remote mail server after RCPT TO:<[email protected]>: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [DB1PEPF0003922E.eurprd03.prod.outlook.com 2025-11-16T04:37:18.638Z 08DE244E7F5CA26B]