If u do change u address..notify BCIS and also fill the change of address form at the postoffice. Since I do software dev. work for the post office and I know about this, IF the bcis sends a mail to your old address, the sort program reads the bar code on the mail and compares that to the any change of addresses in the database.
If there is a hit(last name, first name) on the read mail to the first name, last name in the database, it prints out the new yellow label and labels your new address...
IF there are more than 1 person with first name, last name. Its sits on the conveyor belt going round and round until a HUMAN postal inspector picks up and actually figures out who it goes to...
Once you change your address at the post office, It also notifies every sender of your mail of your address change...!
The program is called SPS(sort program system) and I am honored to do work on it