diff --git a/gestion/gen_confs/bind.py b/gestion/gen_confs/bind.py
index 4eff691e..81904618 100644
--- a/gestion/gen_confs/bind.py
+++ b/gestion/gen_confs/bind.py
@@ -166,7 +166,7 @@ zone "%(NOM_zone)s" {
         direct['crans.org'] +='; Parametres SPF\n'
         direct['crans.org'] +='crans.org.\tIN\tTXT\t"v=spf1 a mx ?all"\n'
         for m in self.MXs:
-            direct['crans.org'] +='%s.\tIN\tTXT\t"v=spf1 a -all"\n' % m.split()[-1]
+            direct['crans.org'] +='%s.\tIN\tTXT\t"v=spf1 a ?all"\n' % m.split()[-1]
         direct['crans.org'] += '\n'
 
         direct['crans.ens-cachan.fr'] ='; Parametres SPF\n'