·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]
·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 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]