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 alt1.gmail-smtp-in.l.google.com [142.250.4.27] SMTP error from remote mail server after pipelined end of data: 550-5.7.1 [128.204.223.95 12] Gmail has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. For more information, go to 550 5.7.1 support.google.com/mail/?p=UnsolicitedMessageError d2e1a72fcca58-7b924aeec59si4932078b3a.181 – gsmtp [email protected] host alt1.gmail-smtp-in.l.google.com [142.250.4.27] SMTP error from remote mail server after pipelined end of data: 550-5.7.1 [128.204.223.95 12] Gmail has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. For more information, go to 550 5.7.1 support.google.com/mail/?p=UnsolicitedMessageError d2e1a72fcca58-7b924aeec59si4932078b3a.181 – gsmtp [email protected] host alt1.gmail-smtp-in.l.google.com [142.250.4.27] SMTP error from remote mail server after pipelined end of data: 550-5.7.1 [128.204.223.95 12] Gmail has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. For more information, go to 550 5.7.1 support.google.com/mail/?p=UnsolicitedMessageError d2e1a72fcca58-7b924aeec59si4932078b3a.181 – gsmtp [email protected] host eur.olc.protection.outlook.com [52.101.68.38] SMTP error from remote mail server after RCPT TO:<[email protected]>: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [DU2PEPF00028CFF.eurprd03.prod.outlook.com 2025-11-16T04:44:11.964Z 08DE246B60E2ACF5]