421 4.4.5 Service not available, too many connections, code=CL82
421 4.4.5 Service not available, too many connections, code=CL82 421 # …
421 4.4.5 Service not available, too many connections, code=CL82 查看全文
退信分析
550 Mail is rejected by recipients
550 Mail is rejected by recipients 退信原因：对方拒收邮件 解决方案：由于对方把你的邮箱地址加入了黑名单， …
550 Backend Replied [xxx.mxlogic.net]:Denied by policy (Mode: normal)
550 Backend Replied [xxx.mxlogic.net]:Denied by policy (Mode: normal) …
550 Backend Replied [xxx.mxlogic.net]:Denied by policy (Mode: normal) 查看全文
554 Content filter will not allow this message
554 Content filter will not allow this message (Mode: normal) 554 Sorr …
554 5.7.1 This message has been blocked because ASE reports it as spam
554 5.7.1 This message has been blocked because ASE reports it as spam …
554 5.7.1 This message has been blocked because ASE reports it as spam 查看全文
550 Denied by policy
550 Denied by policy 退信原因：被对方反垃圾策略拦截 解决方案：退信表示由于收信服务器策略而拒绝邮件。有可能是您的邮件内 …
550 ACL:RE Hit acl, permission deny
550 ACL:RE Hit acl, permission deny 退信原因：IP未被许可连接 解决方案：[2018-7-2更新：] 出 …
550 5.7.0 Local Policy Violation. check SPF
550 5.7.0 Local Policy Violation. check SPF 退信原因： SPF检查不通过拒收 解决方案：通过上面 …
553 sorry, you must authentication
553 sorry, you must authentication530 5.7.1 Client was not authenticat …
Requested mail action not taken: Invalid IP
Requested mail action not taken: Invalid IP <xx.xx.xx.xx> 退信原因：这 …