diff --git a/conf/config.php b/conf/config.php
index 465824c..2b02c5e 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -88,8 +88,8 @@ $config = [
     /* general config */
     'use_smtp' => true,                     // use email for polls creation/modification/responses notification
     'smtp_options' => [
-        'host' => 'localhost',              // SMTP server (you could add many servers (main and backup for example) : use ";" like separator
-        'auth' => false,                    // Enable SMTP authentication
+        'host' => '__MAIN_DOMAIN__',              // SMTP server (you could add many servers (main and backup for example) : use ";" like separator
+        'auth' => true,                    // Enable SMTP authentication
         'username' => '__APP__',            // SMTP username
         'password' => '__MAIL_PWD__',       // SMTP password
         'secure' => false,                  // Enable encryption (false, tls or ssl)
diff --git a/scripts/_common.sh b/scripts/_common.sh
index ed42679..7c1eb27 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -6,6 +6,8 @@
 
 YNH_COMPOSER_VERSION="2.1.1"
 
+main_domain=$(cat /etc/yunohost/current_host)
+
 #=================================================
 # PERSONAL HELPERS
 #=================================================