No Mail Receptacle (NMR)
The USPS defines this NIXIE code as the address lacking an official USPS acceptable mail receptacle.
For example, some gated communities have a mail center rather than having a mailbox in front of each house. In this case, 123 Gate Street cannot be delivered as there is no mailbox – it instead would need to go to Box 123 Gate Mail Center.
These are usually flagged by the USPS with a phantom route (CRRT of R777) or another more obvious problem return code.
This is also a common return code for locations impacted by natural disasters, see our Deliverability Suppression Service (DSS)