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553 sorry, that address is not in my list of allowed recipients; no valid cert for gatewaying[2024-6-29]
554 Message is not RFC compliant[2024-6-29]
554 Refused. Your domain name is listed in the RHSBL at dbl.spamhaus.org[2024-6-29]
550 RP:FRL 网易邮箱不开放匿名转发（Open relay）[2024-6-29]
553 sorry, you don't authenticate or the domain isn't in the list of allowed rcpthosts[2024-6-29]
452 4.3.1 Insufficient system resources[2024-6-29]
550 5.1.1 Error: invalid recipients is found from[2024-6-29]
550 Requested mail action not taken: Fake sender[2024-6-29]
554 5.7.1 Message rejected because of unacceptable content[2024-6-29]
553-you are trying to use me [server-15.tower-188.messagelab 553-s.com] as a relay[2024-6-29]
550 5.7.1 [CS] Spam Detected. Contact your service provider for support[2024-6-29]
550 action not taken, too long header[2024-6-29]
554 5.7.1 You are not allowed to connect[2024-6-29]
553 5.7.1 SpamTrap=reject mode[2024-6-29]
550 unable to validate sender address using callback[2024-6-29]
The semaphore timeout period has expired[2024-6-29]
550 5.7.511 Access denied, banned sende[2024-6-29]
554 5.7.1 The message from with the subject of matches a profile the Internet community may consider spam[2024-6-29]
552 Too much mail data[2024-6-29]
554 Sorry, message looks like SPAM to me[2024-6-29]
550-Verification failed for[2024-6-29]
Email exceeds maxinmum nested level[2024-6-29]
550 5.7.1 Header contents violates site policy id=58A64CDB.001[2024-6-29]
500 Line too long[2024-6-29]
550 Sender has no A, AAAA, or MX DNS records[2024-6-29]
550 Relaying mail to 81170011@cptt.com.tw is not allowed[2024-6-29]
554 mail server permanently rejected message (#5.3.0)[2024-6-29]
552 Sorry, your host is blocked by spam detection system[2024-6-29]
554 5.7.1 Client host rejected: Access denied[2024-6-29]
451 Failed to store message for[2024-6-29]
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