·550 Not verified by SPF[2016-5-19]
·554 5.7.1 : Recipient address rejected: Access denied[2016-5-19]
·554 5.7.1 The message matches a profile the Internet community may consider spam[2016-5-19]
·550 permanent failure for one or more recipients[2016-5-19]
·550 5.7.1 Unable to deliver to[2016-5-19]
·554 sender is rejected[2016-5-19]
·554 5.7.1 You are not allowed to connect by Symantec Security Center[2016-5-18]
·421 Read data from client error[2016-5-18]
·550 SC-001 (COL004-MC6F26) Unfortunately, messages from xx weren't sent[2016-5-18]
·553 you don't authenticate or the domain is not allowed relay[2016-5-14]
·450 4.3.2 try again later[2016-5-14]
·554 Transaction failed[2016-5-13]
·451 4.7.0 Temporary server error. Please try again later. PRX4[2016-5-12]
·There was a timeout while talking to the remote server[2016-5-12]
·503 Error: need EHLO and AUTH first ![2016-5-12]
·421 5.7.1 rejected[2016-5-12]
·550 5.7.1 Recipient rejected (R4)[2016-5-11]
·550 Unknown local part[2016-5-11]
·550 Deliver to local org only[2016-5-11]
·550 5.7.606 Access denied, banned sending IP[2016-5-11]
·552 Message size exceeds maximum permitted;552 5.3.4 Error: message file too big[2016-5-10]
·500 5.0.0 Service unavailable[2016-5-9]
·501 This server will not accept forged credentials[2016-5-9]
·550 Sender frequency limited[2016-5-9]
·553 can't verify FROM domain in DNS;domain does not exist[2016-5-9]
·450 Client host rejected: cannot find your hostname[2016-5-9]
·552-5.2.3 Your message exceeded Google's message size limits[2016-5-8]
·550 5.7.606 Access denied, banned sending IP[2016-5-8]
·451 Temporary internal failure, please contact your email administrator[2016-5-8]
·501 Bad address syntax[2016-5-8]