Hi ep,

1. Yes you can add auto respond email but you should do this with custom code, when contact form is submitted this hook is executed:

(view large image)

2. You can change sender email/name with this plugin:

https://wordpress.org/plugins/wp-default-sender-email-by-it-pixelz/

3. To change subject you can apply hooks:

function kalium_contact_form_subject_custom( $subject, $form_fields, $form_options ) {
    // From $form_fields you can access name, email, subject, message
    // For example $form_fields['name']
    return "My custom subject";
}
add_filter( 'kalium_contact_form_subject', 'kalium_contact_form_subject_custom', 10, 3 );

4. To format email body apply this code:

function kalium_contact_form_message_body_custom( $email_body, $form_fields, $form_options ) {
    $name = $form_fields['name'];
    $email = $form_fields['email'];
    $subject = $form_fields['subject']; // Subject field (different from mail subject)
    $message = $form_fields['message'];
    $custom_body = "From name: $name
Email: $email
Subject: $subject
Message:
$message
Best regards";
    return $custom_body;
}
add_filter( 'kalium_contact_form_message_body', 'kalium_contact_form_message_body_custom' );