try setting things with the config panel

conf/default.env

@@ -25,8 +25,8 @@ MAIL_PORT=25
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
-MAIL_FROM_ADDRESS='__EMAIL__'
-MAIL_FROM_NAME='__EMAIL_FULLNAME__'
+MAIL_FROM_ADDRESS='__DEFAULT_FROM_EMAIL__'
+MAIL_FROM_NAME='__DEFAULT_FROM_NAME__'
 
 DEMO_MODE=false
 

config_panel.toml

@@ -0,0 +1,16 @@
+version = "1.0"
+[main]
+	[main.config]
+	name = "Configuration"
+
+        [main.config.default_from_email]
+        ask = "from email"
+        type = "email"
+        help = "Default email address to use for various automated emails."
+        bind = "default_from_email:__INSTALL_DIR__/.env"
+
+        [main.config.default_from_name]
+        ask = "from name"
+        type = "name"
+        help = "Default name address to use for various automated names."
+        bind = "default_from_name:__INSTALL_DIR__/.env"

manifest.toml

@@ -49,10 +49,22 @@ ram.runtime = "50M"
     type = "user"
 
     [install.password]
-    help.en = "Use the help field to add an information for the admin about this question."
-    help.fr = "Utilisez le champ aide pour ajouter une information à l'intention de l'administrateur à propos de cette question."
+    help.en = "The password to login into InvoiceNinja."
+    help.fr = "Le mot de passe pour se connecter à InvoiceNinja."
     type = "password"
 
+    [install.default_from_email]
+    help.en = "Choose what name will be displayed when InvoiceNinja sends mails."
+    help.fr = ""
+    type = "email"
+    default = ""
+
+    [install.default_from_name]
+    help.en = "Choose from which mail-address mails will be send."
+    help.fr = ""
+    type = "string"
+    default = ""
+
 [resources]
 
     [resources.sources]

scripts/config

@@ -0,0 +1,9 @@
+# we need to clear invoiceninja's cache after updating vars
+# through the config-panel.
+ynh_app_config_apply() {
+    _ynh_app_config_apply
+    pushd "$install_dir"
+        # Optimize the framework for better performance
+	php$phpversion artisan optimize --no-interaction --verbose
+    popd
+}

scripts/install

@@ -17,8 +17,8 @@ api_secret="$(ynh_string_random --length=32)"
 app_key="$(ynh_string_random --length=32)"
 phantomjs_key="$(ynh_string_random --length=32)"
 
-email_fullname="$(ynh_user_get_info --username=$admin --key=fullname)"
-email="$(ynh_user_get_info --username=$admin --key=mail)"
+ynh_app_setting_set --app="$app" --key=default_from_email --value="$default_from_email"
+ynh_app_setting_set --app="$app" --key=default_from_name --value="$default_from_name"
 
 #=================================================
 # STORE KEYS TO APP SETTINGS
@@ -69,7 +69,7 @@ ynh_script_progression --message="Building the application..." --weight=1
 pushd "$install_dir"
 	# Run the database migrations and initially fill the db
 	php$phpversion artisan migrate:fresh --seed --no-interaction --verbose --force
-	php$phpversion artisan ninja:create-account --email $email --password "$password" --no-interaction --verbose
+	php$phpversion artisan ninja:create-account --email $default_from_email --password "$password" --no-interaction --verbose
 	php$phpversion artisan optimize --no-interaction --verbose
 	php$phpversion artisan view:clear
 	php$phpversion artisan cache:clear

scripts/upgrade

@@ -53,12 +53,18 @@ ynh_script_progression --message="Ensuring backward compatibility..." --weight=1
 # Delete deprecated `firstname`/`lastname` settings. See upstream https://github.com/YunoHost/yunohost/pull/1516
 ynh_app_setting_delete --app=$app --key=email_firstname
 ynh_app_setting_delete --app=$app --key=email_lastname
-ynh_app_setting_delete --app=$app --key=email # also delete unnecessary duplicate of state storage
 
-# Retrieve `$admin` user settings
-email_fullname="$(ynh_user_get_info --username=$admin --key=fullname)"
-email="$(ynh_user_get_info --username=$admin --key=mail)"
+default_from_email=$(ynh_app_setting_get --app="$app" --key=default_from_email)
+if [ -z "$default_from_email" ]; then
+	default_from_email="${app}@${domain}"
+	ynh_app_setting_set --app="$app" --key=default_from_email --value="$default_from_email"
+fi
 
+default_from_name=$(ynh_app_setting_get --app="$app" --key=default_from_name)
+if [ -z "$default_from_name" ]; then
+	default_from_name="${app}@${domain}"
+	ynh_app_setting_set --app="$app" --key=default_from_name --value="$default_from_name"
+fi
 #=================================================
 # UPDATE A CONFIG FILE
 #=================================================