diff --git a/check_process b/check_process
index dbcb8a3..c8dd4a8 100644
--- a/check_process
+++ b/check_process
@@ -8,6 +8,8 @@
         domain="domain.tld"	(DOMAIN)
         path="/path"	(PATH)
         is_public=1	(PUBLIC|public=1|private=0)
+        install_extensions=1
+        access_domain="/"
     ; Checks
         pkg_linter=1
         setup_sub_dir=1
diff --git a/conf/message b/conf/message
new file mode 100644
index 0000000..8b5460d
--- /dev/null
+++ b/conf/message
@@ -0,0 +1,4 @@
+Standard Notes - syncing server was successfully __TYPE__.
+Please configure the Standard Notes web app or mobile app to use this syninc server: https://__DOMAIN____PATH_URL__/
+__CONFIG_PANEL__
+__EXTENSIONS__
diff --git a/conf/nginx.conf b/conf/nginx.conf
index 6f55e7c..6419998 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -1,8 +1,3 @@
-location = /favicon.ico {
-    alias /opt/yunohost/snserver/live/public/favicon/favicon.ico;
-    expires 30d;
-}
-
 location __PATH__/ {
     alias __FINALPATH__/live/public ;
 
@@ -18,5 +13,5 @@ location __PATH__/ {
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_buffering off;
 
-    more_set_headers "X-Frame-Options" : "allow-from __ACCESS_DOMAIN__";
+    more_set_headers "X-Frame-Options: allow-from __ACCESS_DOMAIN__";
 }
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 02ec33c..dc6d9da 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -43,6 +43,145 @@ exec_as() {
 # EXPERIMENTAL HELPERS
 #=================================================
 
+# Send an email to inform the administrator
+#
+# usage: ynh_send_readme_to_admin --app_message=app_message [--recipients=recipients] [--type=type]
+# | arg: -m --app_message= - The file with the content to send to the administrator.
+# | arg: -r, --recipients= - The recipients of this email. Use spaces to separate multiples recipients. - default: root
+#	example: "root admin@domain"
+#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
+#	example: "root admin@domain user1 user2"
+# | arg: -t, --type= - Type of mail, could be 'backup', 'change_url', 'install', 'remove', 'restore', 'upgrade'
+ynh_send_readme_to_admin() {
+	# Declare an array to define the options of this helper.
+	declare -Ar args_array=( [m]=app_message= [r]=recipients= [t]=type= )
+	local app_message
+	local recipients
+	local type
+	# Manage arguments with getopts
+
+	ynh_handle_getopts_args "$@"
+	app_message="${app_message:-}"
+	recipients="${recipients:-root}"
+	type="${type:-install}"
+
+	# Get the value of admin_mail_html
+	admin_mail_html=$(ynh_app_setting_get $app admin_mail_html)
+	admin_mail_html="${admin_mail_html:-0}"
+
+	# Retrieve the email of users
+	find_mails () {
+		local list_mails="$1"
+		local mail
+		local recipients=" "
+		# Read each mail in argument
+		for mail in $list_mails
+		do
+			# Keep root or a real email address as it is
+			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
+			then
+				recipients="$recipients $mail"
+			else
+				# But replace an user name without a domain after by its email
+				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
+				then
+					recipients="$recipients $mail"
+				fi
+			fi
+		done
+		echo "$recipients"
+	}
+	recipients=$(find_mails "$recipients")
+
+	# Subject base
+	local mail_subject="☁️🆈🅽🅷☁️: \`$app\`"
+
+	# Adapt the subject according to the type of mail required.
+	if [ "$type" = "backup" ]; then
+		mail_subject="$mail_subject has just been backup."
+	elif [ "$type" = "change_url" ]; then
+		mail_subject="$mail_subject has just been moved to a new URL!"
+	elif [ "$type" = "remove" ]; then
+		mail_subject="$mail_subject has just been removed!"
+	elif [ "$type" = "restore" ]; then
+		mail_subject="$mail_subject has just been restored!"
+	elif [ "$type" = "upgrade" ]; then
+		mail_subject="$mail_subject has just been upgraded!"
+	else	# install
+		mail_subject="$mail_subject has just been installed!"
+	fi
+
+	local mail_message="This is an automated message from your beloved YunoHost server.
+
+Specific information for the application $app.
+
+$(if [ -n "$app_message" ]
+then
+	cat "$app_message"
+else
+	echo "...No specific information..."
+fi)
+
+---
+Automatic diagnosis data from YunoHost
+
+__PRE_TAG1__$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')__PRE_TAG2__"
+
+	# Store the message into a file for further modifications.
+	echo "$mail_message" > mail_to_send
+
+	# If a html email is required. Apply html tags to the message.
+ 	if [ "$admin_mail_html" -eq 1 ]
+ 	then
+		# Insert 'br' tags at each ending of lines.
+		ynh_replace_string "$" "<br>" mail_to_send
+
+		# Insert starting HTML tags
+		sed --in-place '1s@^@<!DOCTYPE html>\n<html>\n<head></head>\n<body>\n@' mail_to_send
+
+		# Keep tabulations
+		ynh_replace_string "  " "\&#160;\&#160;" mail_to_send
+		ynh_replace_string "\t" "\&#160;\&#160;" mail_to_send
+
+		# Insert url links tags
+		ynh_replace_string "__URL_TAG1__\(.*\)__URL_TAG2__\(.*\)__URL_TAG3__" "<a href=\"\2\">\1</a>" mail_to_send
+
+		# Insert pre tags
+		ynh_replace_string "__PRE_TAG1__" "<pre>" mail_to_send
+		ynh_replace_string "__PRE_TAG2__" "<\pre>" mail_to_send
+
+		# Insert finishing HTML tags
+		echo -e "\n</body>\n</html>" >> mail_to_send
+
+	# Otherwise, remove tags to keep a plain text.
+	else
+		# Remove URL tags
+		ynh_replace_string "__URL_TAG[1,3]__" "" mail_to_send
+		ynh_replace_string "__URL_TAG2__" ": " mail_to_send
+
+		# Remove PRE tags
+		ynh_replace_string "__PRE_TAG[1-2]__" "" mail_to_send
+	fi
+
+	# Define binary to use for mail command
+	if [ -e /usr/bin/bsd-mailx ]
+	then
+		local mail_bin=/usr/bin/bsd-mailx
+	else
+		local mail_bin=/usr/bin/mail.mailutils
+	fi
+
+	if [ "$admin_mail_html" -eq 1 ]
+	then
+		content_type="text/html"
+	else
+		content_type="text/plain"
+	fi
+
+	# Send the email to the recipients
+	cat mail_to_send | $mail_bin -a "Content-Type: $content_type; charset=UTF-8" -s "$mail_subject" "$recipients"
+}
+
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
diff --git a/scripts/change_url b/scripts/change_url
index 29023a0..8aefeb4 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -167,6 +167,31 @@ ynh_script_progression --message="Reloading nginx web server..." --weight=1
 
 ynh_systemd_action --service_name=nginx --action=reload
 
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+ynh_script_progression --message="Sending a readme for the admin..."
+
+admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
+
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+You changed the url of the syncing server. All extensions installed from here must be reinstalled by the users."
+config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+
+ynh_replace_string --match_string="__TYPE__" --replace_string="changed the url" --target_file="../conf/message"
+ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
+ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
+
+if [ $install_extensions ]
+then
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
+else
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="" --target_file="../conf/message"
+fi
+ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+
+ynh_send_readme_to_admin --app_message="../conf/message" --type='upgrade'
+
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/install b/scripts/install
index f5c91a9..1060cb2 100755
--- a/scripts/install
+++ b/scripts/install
@@ -279,6 +279,34 @@ ynh_script_progression --message="Reloading nginx web server..."  --weight=1
 
 ynh_systemd_action --service_name=nginx --action=reload
 
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+ynh_script_progression --message="Sending a readme for the admin..."
+
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+If you want to change the url of the syncing server all extensions from here have to be reinstalled be the users."
+message_no_extensions="You have no extensions installed.\
+You can configure this app by using the config-panel"
+
+admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
+config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+
+ynh_replace_string --match_string="__TYPE__" --replace_string="installed" --target_file="../conf/message"
+ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
+ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
+
+if [ $install_extensions ]
+then
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
+else
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_no_extensions" --target_file="../conf/message"
+fi
+ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+
+ynh_send_readme_to_admin --app_message="../conf/message" --type='install'
+
+echo ../conf/message
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 62997c3..b5fe754 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -35,6 +35,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
+install_extensions=$(ynh_app_setting_get --app=$app --key=install_extensions)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
diff --git a/scripts/upgrade b/scripts/upgrade
index 7a7cdc3..1ba1cf7 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -25,6 +25,7 @@ db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
 port=$(ynh_app_setting_get --app=$app --key=port)
+install_extensions=(ynh_app_setting_get --app=$app --key=install_extensions)
 access_domain=(ynh_app_setting_get --app=$app --key=access_domain)
 
 #=================================================
@@ -305,6 +306,33 @@ ynh_script_progression --message="Reloading nginx web server..." --weight=1
 
 ynh_systemd_action --service_name=nginx --action=reload
 
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+ynh_script_progression --message="Sending a readme for the admin..."
+
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+If you want to change the url of the syncing server all extensions from here have to be reinstalled be the users."
+message_no_extensions="You have no extensions installed.\
+You can configure this app by using the config-panel"
+
+admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
+config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+
+ynh_replace_string --match_string="__TYPE__" --replace_string="installed" --target_file="../conf/message"
+ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
+ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
+
+if [ $install_extensions ]
+then
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
+else
+    ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_no_extensions" --target_file="../conf/message"
+fi
+ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+
+ynh_send_readme_to_admin --app_message="../conf/message" --type='upgrade'
+
 #=================================================
 # END OF SCRIPT
 #=================================================