|  | Unlike the United States Postal Service®, some shipping companies charge a higher price for delivery to a residence. If you are shipping to residences, you may lower costs by shipping with the Postal Service™ and avoid residential delivery surcharges. 
 RDI™ enabled software helps you make informed shipping decisions by identifying whether a delivery type is classified as residential or business. The RDI™ data product licensed by the Postal Service works with certified CASS™ software or an address standardization tool provider to verify delivery type status.
 
 Get started with RDI delivery type indicator by contacting a Certified Vendor.  Or find out how to license the RDI product for use with your own certified CASS™ software or an address standardization tool by contacting the National Customer Support Center at 800-589-5766.
 
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    |  | Goodbye costly residential   surcharges! |  |  
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    |  |  | Now there's a low cost solution for avoiding costly residential surcharges. |  |  
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    |  | RDI Certified Vendors |  |  
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    |  |  | Check out a current list of certified RDI vendors. |  |  
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