diff --git a/syncmail b/syncmail
index daa96667..403f59ca 100755
--- a/syncmail
+++ b/syncmail
@@ -274,6 +274,7 @@ From: %(name)s <%(address)s>
 To: %(people)s''' % vars
             if replyto:
                 print 'Reply-To: %s' % replyto
+            print "X-Bloublou: %s" % charset
             if charset:
                 print 'MIME-Version: 1.0\nContent-Type: text/plain; charset=%s\nContent-Transfer-Encoding: 8bit' % charset
             print '''\