·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]
·SPF Permanent Error: Void lookup limit of 2 exceeded的解决方法[2017-3-4]
·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]
·550 5.7.1 Header contents violates site policy id=58A64CDB.001[2017-2-18]
·Email exceeds maxinmum nested level[2017-1-24]
·550-Verification failed for[2017-1-14]
·554 Sorry, message looks like SPAM to me[2017-1-14]
·552 Too much mail data[2017-1-14]
·554 5.7.1 The message from with the subject of matches a profile the Internet co[2017-1-14]
·550 5.7.511 Access denied, banned sende[2016-12-28]
·The semaphore timeout period has expired[2016-12-28]
·550 unable to validate sender address using callback[2016-12-24]