Hello everybody i need your help =)

I'm doing a NNTP client application for Android and i have a problem about replying a post...

When i send this to the server: (yes I am french ... lol)

Code:
From: myemail@domain.fr
Newsgroups: bx1.test
References: <k2cg81$2ke$1@antares.drimm.u-bordeaux1.fr>
Date: Sun, 14 Oct 2012 20:51:13 +0200
Subject: Testing

Test
...