退信分析_专业邮件中继，反垃圾网关，海外邮件中继，邮件中继转发服务，邮件中继服务器

·550 Mail was identified as spam	[2022-3-24]
·554 failed MAIL FROM verification with the FROM field in message header	[2022-3-22]
·suspected spams or account(IP) exception	[2021-6-2]
·Recipient address rejected:ERS-QIL	[2021-1-11]
·554 5.6.1 Body type not supported by Remote Host	[2020-5-11]
·554 rcpt is rejected: 218	[2020-1-7]
·554 5.7.1 Delivery not authorized	[2018-12-17]
·598 maillist rejected	[2018-1-22]
·139邮箱常见退信说明	[2017-11-17]
·552 5.1.1 Mailbox delivery failure policy error	[2017-11-3]
·554 rejected due to spam URL in content	[2017-6-1]
·Requested mail action not taken: Invalid IP	[2017-5-26]
·553 sorry, you must authentication	[2017-5-26]
·550 5.7.0 Local Policy Violation. check SPF	[2017-5-26]
·550 ACL:RE Hit acl, permission deny	[2017-5-26]
·550 Denied by policy	[2017-5-26]
·554 5.7.1 This message has been blocked because ASE reports it as spam	[2017-5-26]
·554 Content filter will not allow this message	[2017-5-26]
·550 Backend Replied [xxx.mxlogic.net]:Denied by policy (Mode: normal)	[2017-4-23]
·550 Mail is rejected by recipients	[2017-4-6]
·421 4.4.5 Service not available, too many connections, code=CL82	[2017-4-6]
·Could not connect to 0.0.0.0 on port 25 since this would mean connecting to myse	[2017-4-6]
·550 5.7.1 message content rejected	[2017-4-6]
·451 Failed to store message for	[2017-4-6]
·554 5.7.1 Client host rejected: Access denied	[2017-3-20]
·552 Sorry, your host is blocked by spam detection system	[2017-3-7]
·554 mail server permanently rejected message (#5.3.0)	[2017-2-20]
·550 Relaying mail to 81170011@cptt.com.tw is not allowed	[2017-2-20]
·550 Sender has no A, AAAA, or MX DNS records	[2017-2-18]
·500 Line too long	[2017-2-18]

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