Как отправлять feedback на почту?

<section class="system_info_block">
    <div class="wrapper wrapper2">
	<div class="feedback_box">
		<h4>Обратная связь</h4>
		<div class="addform">
			<ul class="ui-form">

			<li class="form-group combo">
				<div class="txt_group">
				<input placeholder="Ваше имя" type="text" maxlength="35" name="name" id="name" class="txt_combo" required>
				<input placeholder="Ваш E-mail" type="email" maxlength="35" name="email" id="email" class="txt_combo" required></div>
			</li>
				<div class="txt_group">
				<li class="form-group">
					<input placeholder="Тема сообщения" type="text" maxlength="45" name="subject" id="subject" class="txt_combo" required>
					<input placeholder="Телефон" type="text" maxlength="45" name="phone" id="phone" class="txt_combo" required>
				</li>
				</div>
				<input type="hidden" name="recip" value="1" />
				<div class="txt_group">
				<li class="form-group">
					<textarea placeholder="Сообщение" name="message" id="message" rows="8" class="txtarea" required></textarea>
				</li>
				</div>
			[recaptcha]
				<li class="form-group">{recaptcha}</li>
			[/recaptcha]
			[question]
				<li class="form-group">
					<label for="question_answer">Вопрос: {question}</label>
					<input placeholder="Ответ" type="text" name="question_answer" id="question_answer" class="wide" required>
				</li>
			[/question]
			</ul>
			<div class="form_submit">
			<div class="txt_group" style="height:60px;">
				[sec_code]
					<div class="c-captcha">
						{code}
						<input placeholder="Повторите код" title="Введите код указанный на картинке" type="text" name="sec_code" id="sec_code" class="txt_sec" required>
					</div>
				[/sec_code]
				<button class="btn btn-big" type="submit" name="send_btn"><b>Отправить сообщение</b></button>
				</div>
			</div>
		</div>
	
	</div>
    </div>
</section>