We are managing an exchange server for a client and they are experiencing problems sending to only one domain.
The domain is hk.starcont.com
The client can send from private POP accounts such as gmail. We can send from our Exchange email accounts. Our Exchange and our clients use separate servers.
Most times when our client sends email to this domain, they do not get a bounce back email.
Our Exchange engineers have confirmed that the emails are leaving our clients exchange server.
Using MXToolbox's DNS lookup tool:
No Results Found
Reported by zimdns.hk.starcont.com on Wednesday, January 16, 2013 at 2:15:24 AM (UTC -6) Transcript
We have asked starcont.com to make sure that this client's emails are not being filtered / blocked by proofpoint or other firewalls. and they have responded back that there is nothing blocking them.
Any help or suggestions is appreciated.