Exchange 2013 "451 4.7.0 Temporary server error. Please try again later. PRX5" Error

I know this error message is discussed on other topics on several different forums including TechNet but I ended up opening this as the suggestions that solved the problems with the previous threads dos not work on mine. 
We have a ticketing software that runs on client computers which sends mails to local Exchange server for notifications using port 25. 
Approximately 1 out of 5 mails end up getting the "451 4.7.0 Temporary server error. Please try again later. PRX5" error. I have confirmed this by running Wireshark on the clients, saw the exact error message. This has been replicated with
several client machines running Win7 & 8.
I have tried several solutions to this, one of them being this:
http://www.techieshelp.com/exchange-2013-451-4-7-0-temporary-server-error-please-try-again-later-prx5/
I still get the same error from time to time after doing this, so it is not the issue. All the records in local hosts file, receive connector is listening to port 25 on all IPv4 addresses. 
The server has a single NIC and the DNS lookups are done through that single NIC, not through "All available adapters" as set by default on ECP.  
Almost everyone seems to be convinced that this is related to DNS but looking at how fast I get the error message, it doesn't look like it's waiting for a timeout (maybe unrelated, just an observation). Do you think it is possible that the DNS servers themselves
are causing this issue? 
Also, I see Event 5504 on the primary dns server almost all of them coming from the mail server, saying that the DNS query was invalid. It may be related. 
Additional Notes:
- CU6 is applied but did not fix the issue. 
- None of these have solved it for me: http://www.servolutions.com/support/articles/Temporaryservererror2013.htm 
- Receive Connectors do listen to separate ports 25 & 2525 -> There is a single instance of both Transport Service and Edge Transport service respectively. Anonymous users are accepted in both Receive connectors. 

Thank you for your post.
This is a quick note to let you know that we are performing research on this issue.
Niko Cheng
TechNet Community Support
Thank you Niko. I'm looking forward to your answer as I've gone through every post regarding this and none of them worked. I will let everyone know if I can find a solution to this. 

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