forminator-user-email.php

<?php

add_filter(
	'forminator_custom_form_user_registration_before_insert',
	function ($new_user_data) {
		add_action('user_register', 'wpmudev_forminator_filter_user_register_email', 10, 2);

		return $new_user_data;
	}
);

function wpmudev_forminator_filter_user_register_email(int $user_id, array $userdata)
{
	remove_action('user_register', 'wpmudev_forminator_filter_user_register_email');

	add_filter(
		'wp_mail',
		function (array $mail_args) use ($user_id, $userdata) {
			$needle       = 'Account Activated';
			$filter_email = substr($mail_args['subject'], -strlen($needle)) === $needle;

			if ($filter_email) {
				$userdata['user_id']  = $user_id;
				$mail_args['message'] = wpmudev_forminator_registration_email_template($userdata);
				$mail_args['headers'] = array('Content-Type: text/html; charset=UTF-8');

				remove_action('user_register', 'wpmudev_forminator_filter_user_register_email', 10);
			}

			return $mail_args;
		}
	);
}

function wpmudev_forminator_registration_email_template(array $user_data = array())
{
	if (empty($user_data)) {
		return __('Hey! You have registered succesfully!');
	}

	extract($user_data);

	$user            = get_user_by('id', $user_id);
	$site_name       = get_bloginfo('name');
	$home_url        = home_url();
	$login_page      = wp_login_url();
	$key             = get_password_reset_key($user);
	$pass_reset_link = network_site_url("wp-login.php?action=rp&key={$key}&login=" . rawurlencode($user_login), 'login');

	$tpl = "Dear {$user_login},

		<p>Your account on {$site_name} has been activated! Please find your login details below.</p>

		<p>Login page: {$login_page}</p>

		<p>Username: {$user_login}</p>

		<p>
		Password: Use the password that you submitted when registering your account, or set a new password at the link below.<br />
		<a href=\"{$pass_reset_link}\">{$pass_reset_link}</a>
		</p>

		<p>This message was sent from {$home_url}</p>";

	do_action('retrieve_password_key', $user_login, $key);

	return $tpl;
}