No problem at all. As we drop it off at a drop-off point, they'll put the stamps on it, so it really doesn't matter what address is on the back.
If you use the post NL website, then you must enter a valid NL address as the sender, otherwhise it won't accept it.
Lea Members I've met...
LKD 1x, Sharifu 2x, STM 2x, This Land 8x, Lucy 11x, Amy 1x, LKS 2x, KanuTGL 1x, Dani 2x, Dan 2x
Shadow 1x, King Simba 2x, Nephilim 1x, Naline 1x, jazzybbunny 3x, cleargreenwater 1x, HasiraKali 1x, Vidan 1x
avater = Sharifu