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550 5.4.318 Message expired, connection reset (SuspiciousRemoteServerError)(450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError))
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Kamen Lai
Jan 17, 2021, 1:14:52 AM1/17/21
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Hello,
Environment : Postfix 3.3.3.1-1 + 2.3.6-3
The email server run almost 2 years and in recent 2 weeks. Our customer complain some emails can not be received and the send has bounce back NDR with error as below (those email-sender use office 365):-
550 5.4.318 Message expired, connection reset (SuspiciousRemoteServerError)(450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError))
In mail.log have
Jan 14 20:12:13 localhost postfix/smtpd[23875]: connect from mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]
Jan 14 20:12:14 localhost postfix/smtpd[23875]: Anonymous TLS connection established from mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Jan 14 20:12:15 localhost postfix/smtpd[23875]: 9976D18001310: client=mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]
Jan 14 20:12:17 localhost postfix/cleanup[23885]: 9976D18001310: message-id=<AM6PR0602MB38327F53A...@AM6PR0602MB3832.eurprd06.prod.outlook.com>
What is the problem? Anyone can help me
Thanks in advance.
Environment : Postfix 3.3.3.1-1 + 2.3.6-3
The email server run almost 2 years and in recent 2 weeks. Our customer complain some emails can not be received and the send has bounce back NDR with error as below (those email-sender use office 365):-
550 5.4.318 Message expired, connection reset (SuspiciousRemoteServerError)(450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError))
In mail.log have
Jan 14 20:12:13 localhost postfix/smtpd[23875]: connect from mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]
Jan 14 20:12:14 localhost postfix/smtpd[23875]: Anonymous TLS connection established from mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Jan 14 20:12:15 localhost postfix/smtpd[23875]: 9976D18001310: client=mail-eopbgr70050.outbound.protection.outlook.com[40.107.7.50]
Jan 14 20:12:17 localhost postfix/cleanup[23885]: 9976D18001310: message-id=<AM6PR0602MB38327F53A...@AM6PR0602MB3832.eurprd06.prod.outlook.com>
What is the problem? Anyone can help me
Thanks in advance.
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