- CNAME lookup failed temporarily. (#4.4.3) I'm not going to try again; this message has been in the queue too long2013-11-27
- 451 : Name server timeout Warning: message still undelivered after 4 hours Will keep trying until message is 5 days old2013-11-27
- Host topsec.com.cn(219.141.223.204) MAIL FROM said 451 ... Sender domain must resolve2013-11-27
- RCPT TO said 451 domain not found2013-11-27
- Host or domain name not found. Name service error for name=abc.com type=MX: Host not found, try again2013-11-27
- Sender address rejected: Domain not found2013-11-27
- SMTP error from remote mail server after RCPT TO:<123@abc.com>2013-11-27
- <123@abc.com>: User and password not set, continuing without authentication2013-11-27
- Host or domain name not found.type=A: Host not found2013-11-27
- SMTP error, MAIL FROM: 553 sorry, your envelope sender domain must exist2013-11-27
- Delivery to the following recipient has been delayed: abc@yourdomain.com Message will be retried for 2 more day(s)2013-11-27
- DNS Hard Error looking up2013-11-27
- Failed to connect to SMTP host ZYEGROUP.COM because : The server is not responding. The server may be down or you may be experiencing network problems2013-11-27
- Delivery to the following recipient failed permanently: 123@abc.com Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain2013-11-27
- Delivery to the following recipient failed permanently: abc@yourdomain.com Technical details of permanent failure: DNS Error: DNS server returned answer with no data2013-11-27
- SMTP error, RCPT TO: 550 5.7.1 ... we do not relay .(SMTP error, RCPT TO: 550 5.7.1 <123@eabc.com>... we do not relay )2013-11-27
- SMTP error, MAIL FROM: 550 5.1.0 Invalid sender domain2013-11-27
- 550 Sender domain must exist2013-11-27