Move address to the right and recipient to the left in a letter

Question

I wanted to try to write letters in LaTeX but the problem about the layout of the letter is the fact that the sender's address is on the left and the recipient on the right but in French it is supposed to be the opposite. I wanted to know if it was possible to change that. I tried to use the babel package but it didn't change anything. This is the preamble of the document.

\documentclass[12pt,a4paper]{letter}
\usepackage[utf8x]{inputenc} \usepackage{ucs}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\address{my address} 
\signature{my name}