- UnKnown can't find abc.com: Non-existent domain2013-11-27
- <123@abc.com #5.5.0 smtp;550 Neither MX nor MTA found for domain:abc.com>2013-11-27
- 5.3.0 - Other mail system problem 550-MI:SPF2013-11-27
- SMTP error, MAIL FROM: 501 5.1.0 Emetteur invalide. Invalid Sender. OFR003_405 [405]2013-11-27
- SMTP error, MAIL FROM: 553 SPF check refused(softfail)2013-11-27
- SMTP error, RCPT TO: 553 5.7.1 sorry, that domain isn't in my list of allowed rcpthosts (chkuser)2013-11-27
- SMTP error, MAIL FROM: 553 #5.1.8 Domain of sender address does not exist2013-11-27
- domain abc.com MX query return retry2013-11-27
- Host abc.com(195.229.97.9) MAIL FROM said 451 #4.1.8 Domain of sender address does not resolve2013-11-27
- DNS query error: abc.com2013-11-27