diff --git a/scripts/_common.sh b/scripts/_common.sh
index 277549b..e1c34d9 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -7,3 +7,15 @@ YNH_PHP_VERSION="7.3"
 extra_php_dependencies="php-geoip php${YNH_PHP_VERSION}-cli"
 
 lang="fr_FR.UTF-8 en_US.UTF-8 it_IT.UTF-8"
+
+#=================================================
+# PERSONAL HELPERS
+#=================================================
+
+#=================================================
+# EXPERIMENTAL HELPERS
+#=================================================
+
+#=================================================
+# FUTURE OFFICIAL HELPERS
+#=================================================
diff --git a/scripts/install b/scripts/install
index 2b0d1a6..7503b19 100644
--- a/scripts/install
+++ b/scripts/install
@@ -62,6 +62,14 @@ done
 
 locale-gen
 
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Configuring system user..." --weight=1
+
+# Create a system user
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 #INSTALL SOURCES
 #===============================================
@@ -77,9 +85,9 @@ ln -s $final_path/lang/fr $final_path/lang/fr_FR
 ln -s $final_path/lang/it $final_path/lang/it_IT
 ln -s $final_path/www/template-exemple $final_path/template-exemple
 
-#chmod 750 "$final_path"
-#chmod -R o-rwx "$final_path"
-#chown -R $app:www-data "$final_path"
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # CREATE A MYSQL DATABASE
@@ -109,7 +117,6 @@ yunohost tools regen-conf postfix
 #create the virtual aliases file 
 touch $final_path/var/virtual
 postmap $final_path/var/virtual
-chown -R www-data:www-data $final_path
 
 #create an alias for deleted junk adresses
 cp /etc/aliases /etc/aliases.emailpoubelle.bak #backup it 
diff --git a/scripts/remove b/scripts/remove
index bb090c4..174218c 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -85,4 +85,16 @@ yunohost tools regen-conf postfix
 ynh_systemd_action --service_name=nginx --action=reload
 ynh_systemd_action --service_name=postfix --action=reload
 
-ynh_script_progression --message="Removal of $app completed"
+#=================================================
+# REMOVE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Removing the dedicated system user..."
+
+# Delete a system user
+ynh_system_user_delete --username=$app
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Removal of $app completed" --last
diff --git a/scripts/restore b/scripts/restore
index ac8e557..b68e82b 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -48,6 +48,14 @@ test ! -d $final_path \
 
 ynh_restore_file "/etc/nginx/conf.d/$domain.d/$app.conf"
 
+#=================================================
+# RECREATE THE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Recreating the dedicated system user..." --weight=1
+
+# Create the dedicated user (if not existing)
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
@@ -55,6 +63,10 @@ ynh_script_progression --message="Restoring the app main directory..." --weight=
 
 ynh_restore_file --origin_path="$final_path"
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
+
 #=================================================
 # RESTORE THE PHP-FPM CONFIGURATION
 #=================================================
@@ -106,7 +118,7 @@ fi
 #=================================================
 ynh_script_progression --message="Reinstall cron job" --weight=1
 
-ynh_restore_file "/etc/cron.d/$app"
+ynh_restore_file --origin_path="/etc/cron.d/$app"
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 54c1bbd..3e8c2b7 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -67,6 +67,14 @@ if ynh_legacy_permissions_exists; then
   ynh_app_setting_delete --app=$app --key=is_public
 fi
 
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
+
+# Create a dedicated user (if not existing)
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================
@@ -112,11 +120,9 @@ cp -R ../sources/hooks/conf_regen/98-postfix_emailpoubelle /usr/share/yunohost/h
 mv /etc/postfix/main.cf /etc/postfix/main.cf.emailpoubelle.bak
 yunohost tools regen-conf postfix -f
 
-#=================================================
-# SECURE FILES AND DIRECTORIES
-#=================================================
-
-chown -R www-data:www-data $final_path
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # RELOAD SERVICES