diff --git a/scripts/_common.sh b/scripts/_common.sh
index 165efa2..7186e55 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -98,8 +98,11 @@ EOF
 	ynh_store_file_checksum "$finalfail2banfilterconf"
 
 	sudo systemctl restart fail2ban
-	local fail2ban_error=$(tail -n50 /var/log/fail2ban.log | grep "ERROR.*$app")
-	echo "restart=$?"
+	if local fail2ban_error="$(tail -n50 /var/log/fail2ban.log | grep "WARNING Command.*$app.*addfailregex")"
+	then
+		echo "[ERR] Fail2ban fail to load the jail for $app" >&2
+		echo "WARNING${fail2ban_error#*WARNING}" >&2
+	fi
 }
 
 # Remove the dedicated fail2ban config (jail and filter conf files)
@@ -110,3 +113,102 @@ ynh_remove_fail2ban_config () {
 	ynh_secure_remove "/etc/fail2ban/filter.d/$app.conf"
 	sudo systemctl restart fail2ban
 }
+
+#=================================================
+
+# Read the value of a key in a ynh manifest file
+#
+# usage: ynh_read_manifest manifest key
+# | arg: manifest - Path of the manifest to read
+# | arg: key - Name of the key to find
+ynh_read_manifest () {
+	manifest="$1"
+	key="$2"
+	python3 -c "import sys, json;print(json.load(open('$manifest'))['$key'])"
+}
+
+# Exit without error if the package is up to date
+#
+# This helper should be used to avoid an upgrade of a package
+# when it's not needed.
+#
+# To force an upgrade, even if the package is up to date,
+# you have to set the variable YNH_FORCE_UPGRADE before.
+# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
+#
+# usage: ynh_abort_if_up_to_date
+ynh_abort_if_up_to_date () {
+	local force_upgrade=${YNH_FORCE_UPGRADE:-0}
+	local package_check=${PACKAGE_CHECK_EXEC:-0}
+
+	local version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
+	local last_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
+	if [ "$version" = "$last_version" ]
+	then
+		if [ "$force_upgrade" != "0" ]
+		then
+			echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
+			unset YNH_FORCE_UPGRADE
+		elif [ "$package_check" != "0" ]
+		then
+			echo "Upgrade forced for package check." >&2
+		else
+			ynh_die "Up-to-date, nothing to do" 0
+		fi
+	fi
+}
+
+#=================================================
+
+# Send an email to inform the administrator
+#
+# usage: ynh_send_readme_to_admin app_message [recipients]
+# | arg: app_message - The message to send to the administrator.
+# | arg: 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"
+ynh_send_readme_to_admin() {
+	local app_message="${1:-...No specific informations...}"
+	local recipients="${2:-root}"
+
+	# 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")
+
+	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"
+
+	local mail_message="This is an automated message from your beloved YunoHost server.
+
+Specific informations for the application $app.
+
+$app_message
+
+---
+Automatic diagnosis data from YunoHost
+
+$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"
+
+	# Send the email to the recipients
+	echo "$mail_message" | mail -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
+}
diff --git a/scripts/install b/scripts/install
index 7567d65..a3986ac 100644
--- a/scripts/install
+++ b/scripts/install
@@ -251,3 +251,11 @@ systemctl reload nginx
 #=================================================
 
 ynh_secure_remove $final_path/wp-cli.phar
+
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+message="If you facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/wordpress_ynh"
+
+ynh_send_readme_to_admin "$message" "$admin_wordpress"