Incoming Mail Servers Show Null After the Import/Migration

Summary

 After performing an import from another instance, the incoming mail servers are not imported as expected.
 

Environment

• Cloud to Cloud migration
• Server to Cloud migration

Steps to Reproduce

1. On instance A, create some custom incoming mail servers
2. Generate a backup
3. Import the data to instance B

Expected Results

The configurations of incoming mail servers on instance B should be the same as instance A.

Actual Results

The incoming mail servers are imported but with NULL data:

Application logs:
Logs showed the import was done successfully (no error logs).

Workaround  

Recreate the incoming mail servers.