How do you put a stop on a package you sent?

Okay, here's what happened. I sent a package today with an address that a user on Listia had on file. Then he sends me the same exact address but with a different zip code. I had no idea this would happen & I sent it to the zip code provided with the address they had on file. What do I do now? How do I put a stop on the package? Please help. I mean, the user puts an address on file and then sends me the same address but with a different zip code. I mean, put the right one on file.

Will it still get to them? I sent it to New Hampshire and on my receipt it said Hooksett, NH but on the envelope I put Manchester, NH. Will it still get to them? Please help. This happened because they put the wrong zip code on file.