diff --git a/README.rst b/README.rst
index bed8d5f..d36ff59 100644
--- a/README.rst
+++ b/README.rst
@@ -19,9 +19,10 @@ An installer which deploy a complete mail server based on Modoboa.
 
 .. note::
 
-   The server (physical or virtual) running Modoboa needs at least 1GB
+   The server (physical or virtual) running Modoboa needs at least 2GB
    of RAM in order to compile the required dependencies during the
-   installation process.
+   installation process. Passwords should not contain any special characters
+   as they may cause the installation to fail
 
 Usage::
 
diff --git a/modoboa_installer/scripts/files/postfix/master.cf.tpl b/modoboa_installer/scripts/files/postfix/master.cf.tpl
index 75713f8..f149eb8 100644
--- a/modoboa_installer/scripts/files/postfix/master.cf.tpl
+++ b/modoboa_installer/scripts/files/postfix/master.cf.tpl
@@ -25,7 +25,6 @@ submission inet n       -       -       -       -       smtpd
   -o smtpd_client_restrictions=permit_sasl_authenticated,reject
   -o smtpd_helo_restrictions=
   -o smtpd_sender_restrictions=reject_sender_login_mismatch
-  -o smtpd_recipient_restrictions=
   -o milter_macro_daemon_name=ORIGINATING
 %{amavis_enabled}  -o smtpd_proxy_filter=inet:[127.0.0.1]:10026
 #smtps     inet  n       -       -       -       -       smtpd