·550 5.1.1 Error: invalid recipients is found from[2016-8-23]
·452 4.3.1 Insufficient system resources[2016-8-18]
·553 sorry, you don't authenticate or the domain isn't in the list of allowed rcp[2016-7-25]
·550 RP:FRL 网易邮箱不开放匿名转发(Open relay)[2016-7-25]
·554 Refused. Your domain name is listed in the RHSBL at dbl.spamhaus.org[2016-7-8]
·554 Message is not RFC compliant[2016-7-5]
·553 sorry, that address is not in my list of allowed recipients; no valid cert f[2016-7-5]
·553 5.7.1 SpamTrap=reject mode, dsn=5.7.1, Message blocked by BOX Solutions (www[2016-7-5]
·452 Mailbox delivery restricted by policy error[2016-7-1]
·451 4.1.8 Domain of sender address purchase6@XXXXfat.com.cn does not resolve[2016-6-29]
·500 Message rejected[2016-6-29]
·440 mail from account doesnt conform with authentication[2016-6-28]
·554 5.7.1 Message scored extremely high on spam scale. No incident created[2016-6-28]
·554 5.7.1 Message rejected because of unacceptable content[2016-6-28]
·554 front04.ibpmail.net Service not available - from blacklisted IP address[2016-6-28]
·550 5.7.0 Message Size Violation[2016-6-28]
·550 5.7.1 Error: content rejected[2016-6-28]
·554 5.7.1 You are not allowed to connect[2016-6-28]
·554 Your access to this mail system has been rejected due to the sending MTAs po[2016-6-28]
·554 rejecting banned content[2016-6-22]
·552 5.3.4 Error: message file too big from[2016-6-22]
·553 MAIL FROM not matches the address of FROM field in message header[2016-6-22]
·451 4.4.4 Temporary server error. Please try again later ATTR4[2016-6-22]