How could I go about allowing a (not logged in) guest user to submit their email address, check behind the scenes if it belongs to a user account, and then return:

  1. A login form if it does
  2. A registration form if it doesn't

I assume you have basic knowledge about plugins and routing, if not I'll update my post in a few hours.. otherwise Your form could be

<!-- check if user submitted something -->
{% if userExists is defined %}
    {% if userExists == true %}
        <!-- user exists login -->
        hello {{ user.name }}

        <form method="post" accept-charset="UTF-8">
            {{ getCsrfInput() }}
            <input type="hidden" name="action" value="users/login">

            <h3><label for="loginName">Username or email</label></h3>
            <input id="loginName" type="text" name="loginName"
                   value="{{ craft.session.rememberedUsername }}">

            <h3><label for="password">Password</label></h3>
            <input id="password" type="password" name="password">

                <input type="checkbox" name="rememberMe" value="1">
                Remember me

            <input type="submit" value="Login">

            {% if errorMessage is defined %}
                <p>{{ errorMessage }}</p>
            {% endif %}

        <p><a href="{{ url('forgotpassword') }}">Forget your password?</a></p>

    {% else %}
        <!-- user does not exist register -->
        <!-- snip see here for full content https://craftcms.com/docs/templating/user-registration-form -->

    {% endif %}

{% else %}
    <!-- parameter not set show search form -->
    <form method="post">
        <input type="hidden" name="action" value="test/checkEmail">
        <input type="text" name="email">
        <input type="submit">
{% endif %}

And your controller

public function actionCheckEmail(){
    $email = craft()->request->getParam('email');
    if($user = craft()->users->getUserByEmail($email)){
        // user registered
        $userExists = true;
        $userExists = false;
        'userExists'    => $userExists,
        'user'          => $user
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  • Thanks Robin. I'm heading to bed now. I will take a good look tomorrow. – Jonathan Schofield Dec 13 '17 at 23:31

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