Example contact form with a honeypot

contact.htm

<form id="contactform" action="mailer.php" method="post">
	<label>Your name:
		<input type="text" name="name">
	</label>
	<label>Your email:
		<input type="email">
	</label>
	<label style="display:none;">Leave this empty:
		<input type="text" name="honeypot" />
	</label>
	<label>Your message:
		<textarea rows="4"></textarea>
	</label>
	<button class="button" type="submit" value="Submit">Submit</button>
</form>