---
title: "form_extended"
version: "12.2"
source: "Index.md"
start: true
rendered: "2026-10-08T00:28:40+00:00"
---

# form_extended {#form-extended}

## What does it do? {#what-does-it-do}

It extends the form extension with the following features:

-   Double opt-in controller + finisher for realising a registration process
-   country select box by using static_info_tables
-   CopyToSenderEmailFinisher:
-   Multiple file upload support ![Multiple file upload!](Documentation/Images/multiple_upload.png)
-   Privacy policy checkbox: Set ID of policy page
-   New property fields:

    -   info
    -   hide title
    -   hide in receiver mail
    -   hide in sender mail
-   Registration functions

    -   extendable alternative to sf-register
    -   Double Opt-In
    -   fully integrated with form
    -   design flexibility
    -   add your own fields
    -   spam protection
    -   extendable with typical form methods like YAML

## Feature: Set senders in site configuration {#feature-set-senders-in-site-configuration}

With the sender-in-site feature, administrators can define valid senders in the site configuration and editors can select them in the plugins.

First step: Activate the feature in the side wide options.

![Activation!](Documentation/Images/Sender/activation.png)

Second step: Configure new valid addresses

![Sites configuration!](Documentation/Images/Sender/sites.png)

It is no longer possible to set the sender manually.

![Finisher settings!](Documentation/Images/Sender/finisher.png)

Third step: Choose sender address in plugin

![Plugin settings!](Documentation/Images/Sender/plugin.png)