The original message was received at Tue, 28 Jan 2025 10:37:01 +0100 from [165.154.252.200] ----- The following addresses had permanent fatal errors ----- (reason: 550 User not found: louyun@cgnpc.com.cn) (reason: 550 Mail content denied [M0BS2NE0lcNPu1DcBCqcIaUUuy0eUa2yiw6wKh+apthdMcmXliBARZ4= IP: 83.138.65.30]. https://open.work.weixin.qq.com/help2/pc/20056.) (reason: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table) ----- Transcript of session follows ----- 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout ... while talking to jt-e500.cgnpc.com.cn.: >>> DATA ... User unknown 451 4.4.1 reply: read error from jt-e500.cgnpc.com.cn. 451 skhwc.org.hk: Name server timeout ... while talking to mxbiz1.qq.com.: >>> DATA >> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (S77714) [HK2PEPF00006FB1.apcprd02.prod.outlook.com 2025-01-28T09:38:48.900Z 08DD3E48C9786F90] 451 skhwc.org.hk: Name server timeout ... while talking to jedc-pt.mail.protection.outlook.com.: >>> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (S77714) [AMS0EPF00000192.eurprd05.prod.outlook.com 2025-01-28T09:38:53.735Z 08DD3E3326BEF0CC] 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout ... while talking to mediacorp-com-sg.mail.protection.outlook.com.: >>> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (S77714) [SG2PEPF000B66CD.apcprd03.prod.outlook.com 2025-01-28T09:39:34.075Z 08DD3E4818E0A720] 451 skhwc.org.hk: Name server timeout ... while talking to mx1.smtp.goog.: >>> DATA >> DATA >> DATA >> DATA ,,,,,,... Deferred: 421-4.7.28 Gmail has detected an unusual rate of unsolicited mail. To protect 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout ... while talking to mail.ringway.cn.: >>> DATA : Recipient address rejected: User unknown in virtual mailbox table 550 5.1.1 ... User unknown 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 451 skhwc.org.hk: Name server timeout 550 5.1.2 ... Host unknown (Name server: .: host not found) 451 skhwc.org.hk: Name server timeout