The original message was received at Tue, 28 Jan 2025 08:47:36 +0100 from [165.154.252.200] ----- The following addresses had permanent fatal errors ----- (reason: 550 5.4.1 Recipient address rejected: Access denied. [HK2PEPF00006FB1.apcprd02.prod.outlook.com 2025-01-28T07:48:13.490Z 08DD3E48C94DD10C]) (reason: 500 5.0.0 Service unavailable) ----- Transcript of session follows ----- ... while talking to smg.bjtu.edu.cn.: >>> DATA ... Deferred: 450 Requested action not taken: bp5wygAnOKGwi5hn3UmMAA--.18994S3, please try again ... while talking to intl-zju-edu-cn.mail.protection.outlook.com.: >>> DATA ... User unknown ... Deferred: Connection timed out with ldsoft.cn. ... while talking to spam.cichb.gov.tw.: >>> DATA