diff --git a/Python/etc/postfix/main.cf b/Python/etc/postfix/main.cf
index f67cafc..771b23a 100644
--- a/Python/etc/postfix/main.cf
+++ b/Python/etc/postfix/main.cf
@@ -140,10 +140,7 @@ delay_warning_time = "24h"
 @# Esthetisme
 smtpd_banner = "$myhostname ESMTP $mail_name (Debian/GNU)"
 
-if mx:
-    @# Reecriture des entetes
-    canonical_maps = db_file("search")
-else:
+if not mx:
     @# Reecriture des entetes: @host.crans.org -> @crans.org
     canonical_maps = "regexp:/etc/postfix/canonical"