The original message was received at Tue, 28 Jan 2025 09:20:08 +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 ----- ... Deferred: Connection timed out with mail.jndh.cn. ... Deferred: Connection timed out with meas-spec.cn. ... while talking to mxn.mxhichina.com.: >>> DATA >> DATA >> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (AS780082) [SG1PEPF000082E6.apcprd02.prod.outlook.com 2025-01-28T12:08:32.980Z 08DD3ECAF742A5E1] ... while talking to nyp-edu-sg.mail.protection.outlook.com.: >>> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (AS780082) [SG2PEPF000B66C9.apcprd03.prod.outlook.com 2025-01-28T12:08:38.657Z 08DD3E3DF62A9263] ... Deferred: Connection timed out with public.lz.gs.cn.