The original message was received at Tue, 28 Jan 2025 09:24:14 +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.) (reason: 550 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#550 [o3TbCPXSNdyAFp2KjtAtBQ.us112]) ----- Transcript of session follows ----- ... Deferred: Connection timed out with ebloom.cn. ... while talking to jm-com-sg.mail.protection.outlook.com.: >>> DATA ... Deferred: 451 4.7.500 Server busy. Please try again later from [83.138.65.30]. (AS780082) [SG2PEPF000B66CD.apcprd03.prod.outlook.com 2025-01-28T12:37:36.985Z 08DD3E4819321BE3] ... Deferred: Connection timed out with koreanembassy.cn. ... while talking to mail.xjtlu.edu.cn.: ... Deferred: 421 4.7.0 Not allowed. ... while talking to mx-apac.mail.gm0.yahoodns.net.: >>> MAIL From: SIZE=2995 ... Deferred: 421 4.7.0 [TSS04] Messages from 83.138.65.30 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes ... while talking to mx2.fatima.pt.: >>> DATA ... Deferred: 451 4.3.2 Please try again later >> DATA ... Deferred: 451 4.3.2 Please try again later >> DATA >> DATA ... Deferred: Connection timed out with toptex.cn.w.kunluncan.com. ... while talking to us-smtp-inbound-1.mimecast.com.: >>> RCPT To: ... User unknown >>> DATA ... Deferred: Connection timed out with zh-cn.sennheiser.com.cdn.cloudflare.net. Warning: message still undelivered after 4 hours Will keep trying until message is 1 day old