The original message was received at Tue, 28 Jan 2025 09:13:30 +0100 from [165.154.252.200] ----- The following addresses had permanent fatal errors ----- (reason: 451 4.4.1 reply: read error from mxw.mxhichina.com.) ----- Transcript of session follows ----- 451 shuangrong.com.sg: Name server timeout ... Deferred: Connection timed out with 5jltfzmwuz2qvpw0dzdzrtbt6ewjfayx.yundunwaf3.com. ... Deferred: Connection timed out with mail.renault.cn. ... while talking to mail21.hmail.sg.: ,... Deferred: 421 mail11.hmail.sg closing connection ... while talking to mxw.mxhichina.com.: >>> DATA ... Deferred: Connection refused by optiworks.com.cn. ... Deferred: Connection timed out with overdue.aliyun.com. 451 shuangrong.com.sg: Name server timeout ... while talking to reach-org-sg.mail.protection.outlook.com.: >>> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (AS780082) [HK3PEPF00000220.apcprd03.prod.outlook.com 2025-01-28T11:16:27.938Z 08DD3EBABA99765F] ... Deferred: Connection refused by sujianyun1688.cn.