Every Door Direct Mail (EDDM) relies on an online, interactive resource known as the Simplified Mailing Process (SMP) tool (https://smp.usps.gov/). The tool helps businesses determine which type of mailing they qualify for (EDDM or EDDM Retail) and which localities to market to, then walks them through the process of selecting carrier routes and producing documentation. Use of the tool is optional for mailers.