diff --git a/check_process b/check_process
index 9f8650a..fb678a9 100644
--- a/check_process
+++ b/check_process
@@ -3,9 +3,7 @@
 		domain="domain.tld"
 		path="/path"
 		is_public=1
-		language="fr"
-		admin="john"
-		password="1Strong-Password"
+		with_mysql=1
 	; Checks
 		pkg_linter=1
 		setup_sub_dir=1
@@ -18,6 +16,16 @@
 		backup_restore=1
 		multi_instance=1
 		change_url=1
+;; Test without mysql
+	; Manifest
+		domain="domain.tld"
+		path="/path"
+		is_public=1
+		with_mysql=0
+	; Checks
+		setup_sub_dir=1
+		upgrade=1
+		backup_restore=1
 ;;; Options
 Email=
 Notification=none
diff --git a/manifest.json b/manifest.json
index dc9cceb..c110408 100644
--- a/manifest.json
+++ b/manifest.json
@@ -45,6 +45,15 @@
                 "name": "is_public",
                 "type": "boolean",
                 "default": true
+            },
+            {
+                "name": "with_mysql",
+                "type": "boolean",
+                "ask": {
+                    "en": "Do you need a MySQL database?",
+                    "fr": "Avez-vous besoin d'une base de données MySQL ?"
+                },
+                "default": false
             }
         ]
     }
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 6a10801..e6bb09d 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -19,3 +19,60 @@ pkg_dependencies="php-uuid php${YNH_PHP_VERSION}-tidy php${YNH_PHP_VERSION}-redi
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
+
+# 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="${1:-...No specific information...}"
+	local recipients="${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\` has important message for you"
+
+	local mail_message="This is an automated message from your beloved YunoHost server.
+Specific information for the application $app.
+$app_message
+---
+Automatic diagnosis data from YunoHost
+$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"
+	
+	# Define binary to use for mail command
+	if [ -e /usr/bin/bsd-mailx ]
+	then
+		local mail_bin=/usr/bin/bsd-mailx
+	else
+		local mail_bin=/usr/bin/mail.mailutils
+	fi
+
+	# Send the email to the recipients
+	echo "$mail_message" | $mail_bin -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
+}
diff --git a/scripts/backup b/scripts/backup
index 4bae54f..7889fc2 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -32,6 +32,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+with_mysql=$(ynh_app_setting_get --app=$app --key=with_mysql)
 
 #=================================================
 # DECLARE DATA AND CONF FILES TO BACKUP
@@ -67,9 +68,12 @@ ynh_backup --src_path="/etc/logrotate.d/$app"
 #=================================================
 # BACKUP THE MYSQL DATABASE
 #=================================================
-ynh_print_info --message="Backing up the MySQL database..."
 
-ynh_mysql_dump_db --database="$db_name" > db.sql
+if [ $with_mysql -eq 1 ]
+then
+    ynh_print_info --message="Backing up the MySQL database..."
+    ynh_mysql_dump_db --database="$db_name" > db.sql
+fi
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/install b/scripts/install
index 51a13fc..112b87c 100755
--- a/scripts/install
+++ b/scripts/install
@@ -28,6 +28,7 @@ domain=$YNH_APP_ARG_DOMAIN
 path_url=$YNH_APP_ARG_PATH
 is_public=$YNH_APP_ARG_IS_PUBLIC
 timezone="$(date +%:::z)"
+with_mysql=$YNH_APP_ARG_WITH_MYSQL
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -49,6 +50,7 @@ ynh_script_progression --message="Storing installation settings..." --weight=1
 
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
+ynh_app_setting_set --app=$app --key=with_mysql --value=$with_mysql
 
 #=================================================
 # INSTALL DEPENDENCIES
@@ -68,12 +70,16 @@ ynh_system_user_create --username=$app --home_dir="$final_path"
 #=================================================
 # CREATE A MYSQL DATABASE
 #=================================================
-ynh_script_progression --message="Creating a MySQL database..." --weight=2
 
-db_name=$(ynh_sanitize_dbid --db_name=$app)
-db_user=$db_name
-ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name
+if [ $with_mysql -eq 1 ]
+then
+    ynh_script_progression --message="Creating a MySQL database..." --weight=2
+
+    db_name=$(ynh_sanitize_dbid --db_name=$app)
+    db_user=$db_name
+    ynh_app_setting_set --app=$app --key=db_name --value=$db_name
+    ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name
+fi
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -150,6 +156,29 @@ ynh_script_progression --message="Reloading NGINX web server..." --weight=1
 
 ynh_systemd_action --service_name=nginx --action=reload
 
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+if [ $with_mysql -eq 1 ]
+then
+	ynh_script_progression --message="Sending a readme for the admin..." --weight=1
+
+	message="SnappyMail was successfully installed :) with the password found in 
+
+	Please open the admin UI https://$domain$path_url/?admin to configure your mail server settings. Login with user "admin" and password from the file /var/www/webmail/data/_data_/_default_/admin_password.txt.
+
+	Details for MySQL database to be enterted while registration process:
+
+	Database login:    $db_user
+	Database name:     $db_name
+	Database password: $db_pwd
+
+	If you are facing any problem or want to improve this app, please open a new issue here: https://github.com/YunoHost-Apps/snappymail_ynh/issues"
+
+	ynh_send_readme_to_admin "$message"
+fi
+
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index bb3b60b..1527743 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -20,6 +20,7 @@ domain=$(ynh_app_setting_get --app=$app --key=domain)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+with_mysql=$(ynh_app_setting_get --app=$app --key=with_mysql)
 
 #=================================================
 # REMOVE LOGROTATE CONFIGURATION
@@ -32,10 +33,13 @@ ynh_remove_logrotate
 #=================================================
 # REMOVE THE MYSQL DATABASE
 #=================================================
-ynh_script_progression --message="Removing the MySQL database..." --weight=1
 
-# Remove a database if it exists, along with the associated user
-ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
+if [ $with_mysql -eq 1 ]; then
+    ynh_script_progression --message="Removing the MySQL database..." --weight=2
+
+    # Remove a database if it exists, along with the associated user
+    ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
+fi
 
 #=================================================
 # REMOVE APP MAIN DIR
diff --git a/scripts/restore b/scripts/restore
index 53ebca6..48c8396 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -34,6 +34,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+with_mysql=$(ynh_app_setting_get --app=$app --key=with_mysql)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
@@ -91,11 +92,14 @@ ynh_install_app_dependencies $pkg_dependencies
 #=================================================
 # RESTORE THE MYSQL DATABASE
 #=================================================
-ynh_script_progression --message="Restoring the MySQL database..." --weight=1
 
-db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
-ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
-ynh_mysql_connect_as --user=$db_user --password=$db_pwd --database=$db_name < ./db.sql
+if [ $with_mysql -eq 1 ]; then
+    ynh_script_progression --message="Restoring the MySQL database..." --weight=2
+
+    db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
+    ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
+    ynh_mysql_connect_as --user=$db_user --password=$db_pwd --database=$db_name < ./db.sql
+fi
 
 #=================================================
 # RESTORE THE LOGROTATE CONFIGURATION
diff --git a/scripts/upgrade b/scripts/upgrade
index f9f5ca4..ef46f38 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -20,6 +20,7 @@ domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+with_mysql=$(ynh_app_setting_get --app=$app --key=with_mysql)
 
 #=================================================
 # CHECK VERSION