Don't get any Email into admin Email from contact form ?

<?php

function html_form_code(){

	echo '<div id="mainform">

			<!--Contact Form -->
			<div id="contactdiv">
				<form class="form" action="' . esc_url( $_SERVER['REQUEST_URI'] ) . '" method="post" id="contact">
					<img src="' . plugins_url( '../img/button_cancel.png', __FILE__ ) . '" class="img" id="cancel"/>
					<h3>Contact Form</h3>
					<hr/>
					<div class="row shop_address">
						<div class="col-md-6">
							<div class="row">
								<div class="col-md-2">
									<input type="radio" name="sex" value="male" checked>
								</div>
								<div class="col-md-10">
									<h3>Shope Name</h3>
									<p>Sope address for your customar. If he/she want to come then follow it</p>
								</div>
							</div>
						</div>
						<div class="col-md-6">
							<div class="row">
								<div class="col-md-2">
									<input type="radio" name="sex" value="female" >
								</div>
								<div class="col-md-10">
									<h3>Shope Name</h3>
									<p>Sope address for your customar. If he/she want to come then follow it</p>
								</div>
							</div>
						</div>
					</div>
					<div class="row">
						<div class="col-md-12">
							<label>Name: <span>*</span></label><br/>
							<input type="text" id="name" name="cf-name" placeholder="Name" pattern="[a-zA-Z0-9 ]+" value="' . ( isset( $_POST["cf-name"] ) ? esc_attr( $_POST["cf-name"] ) : '' ) . '"/>
						</div>
					</div>
					<div class="row">
						<div class="col-md-12">
							<label>Email: <span>*</span></label><br/>
							<input type="text" id="email" name="cf-email" placeholder="Email" value="' . ( isset( $_POST["cf-email"] ) ? esc_attr( $_POST["cf-email"] ) : '' ) . '"/>
						</div>
					</div>
					<div class="row">
						<div class="col-md-12">
							<label>Stock No: <span>*</span></label><br/>
							<input type="text" id="contactno" placeholder=""/>
						</div>
					</div>
					<div class="row">
						<div class="col-md-12">
							<label>Message:</label>
							<textarea id="message" name="cf-message" placeholder="Message.......">' . ( isset( $_POST["cf-message"] ) ? esc_attr( $_POST["cf-message"] ) : '' ) . '</textarea><br/>
						</div>
					</div>
					<div class="row">
						<div class="col-md-12">
							<input type="button" id="send"  name="cf-submitted" value="Send"/>
						</div>
					</div>

				</form>

			</div>
		</div>';

}

function deliver_mail() {

    // if the submit button is clicked, send the email
    if ( isset( $_POST['cf-submitted'] ) ) {

        // sanitize form values
        $name    = sanitize_text_field( $_POST["cf-name"] );
        $email   = sanitize_email( $_POST["cf-email"] );
        $subject = sanitize_text_field( $_POST["cf-subject"] );
        $message = esc_textarea( $_POST["cf-message"] );

        // get the blog administrator's email address
        $to = get_option( 'admin_email' );

        $headers = "From: $name <$email>" . "\r\n";

        // If email has been process for sending, display a success message
        if ( wp_mail( $to, $subject, $message, $headers ) ) {
            echo '<div>';
            echo '<p>Thanks for contacting me, expect a response soon.</p>';
            echo '</div>';
        } else {
            echo 'An unexpected error occurred';
        }
    }
}

function cf_shortcode() {
    ob_start();
    deliver_mail();
    html_form_code();

    return ob_get_clean();
}
add_shortcode( 'sitepoint_contact_form', 'cf_shortcode' );

?>

I used this code for make a custom contact form. But I don’t got any email into admin email. What wrong with this code ?