Email Delivery Fails to My Domain Running on Exchange 2007 from only One Sender Domain

Email Delivery Fails to My Domain from only One Sender Domain
A problem occurs in Microsoft Exchange 2007 when delivery from only one sender domain fails.
You may get one of these or both error messages,
Error I

   (reason: 550 5.7.1 Sender ID (PRA) Not Permitted)

Error II
554 5.0.0 Service unavailable

Apparently everything is running OK like,
- Email delivery is failed to all users of my domain
- Email communication between your domain and this domain was normal a few days back
- Sender Domain’s reputation is “Good” or “Neutral” as per “senderbase.org” records
- Sender Domain’s SPF records are properly entered
- EDGE Synchronization is working fine
- There are no event Logs on EDGE Transport Server
- Problem comes with only one sender domain
I have studied a lot about this issue and Microsoft does not give any reason of this problem, solution is however there, even on the technet.

Solution
1- Go to EDGE Transport server and create a new custom “Receive Connector”. Provide IP and FQDN of problematic domain in the connector settings.
2- All other security & configuration settings must be exactly as your default receive connector.

After a week or so disable this connector and examine email delivery from this domain. If there is no issue keep this receive connector disabled.