VERIFIED SOLUTION i
MDLPMU is required as part of USPS Postal One the INF card MDLPMU is based on the Date and Method. The information required by MailStream Plus [MSP] is for the type of Move/Update procedure performed on the input file prior to MailStream Plus as part of a hygiene process to correct address information. Pitney Bowes offers two applications to correct address/ zipcode information [CODE 1 PLUS and FINALIST]. The MSP software process isn't based on address information but rather on zip code information and with better zip code information MSP can provided a better USPS sortation process.
UPDATED: August 31, 2017