Postmarked envelopes, London to Pennsylvania??

Question

My friend may be moving to London. I want to give her some pre-postmarked envelopes so that she can write me letters without worrying about postage. We live in the states, and I need to know how to postmark the envelopes to myself so that when she sends them, they will reach me!

Answer 1

you just need to write on the front of the envolope

your name

house numder                                          

streetname                                              

state/province

united state

zip code

place a postage stamp on the top right hand corner