The original message was received at Tue, 28 Jan 2025 09:26:51 +0100 from [165.154.252.200] ----- The following addresses had permanent fatal errors ----- (reason: 554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554 [jVOjl9LzMg20wfzd5v0RMw.uk83]) (reason: 451 4.4.1 reply: read error from mx2.qiye.aliyun.com.) (reason: 451 4.4.1 reply: read error from mxw.mxhichina.com.) ----- Transcript of session follows ----- ... while talking to eu-smtp-inbound-1.mimecast.com.: >>> DATA ... Deferred ... while talking to mx1.qiye.aliyun.com.: >>> DATA >> DATA >> DATA >> DATA >> DATA ... Deferred: 454 Transient reject by behaviour spamANTISPAM_BAT[01201311R860, maildocker-behaviorspam033055200174]: rejected by antispam ... Deferred: Connection refused by siris.cm.cn. Warning: message still undelivered after 4 hours Will keep trying until message is 1 day old