php contact form

I created a page template named contactform.php and linked my contact page to this template.

here the code:

<?php

    //Some variables
    $mymail = "sample@domain.com";
    $name = $_POST['name'];
    $email = $_POST['email'];
    $phone = $_POST['phone'];
	$find = $_POST['find'];
    $eip = $_POST['eip'];

    //Function to check email address
    function checkemail($email) {
      if(eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$",$email))  {
        return true;
      }
      else {
        return false;
      }
    }

  //Mail Processing
  if ($_POST['esubmit']) {
    //Check for blank fields
    if ($name == "" || $email == "" || $phone == "") {
      echo "<p>You left a blank field.<br/>Please try again.</p>";}
    //Check to see if the email address is valid
    else if (checkemail($email) == false) {
       echo "<p>You entered an invalid email address.</p>";}
    //Send the email if there's no error
    else {
      $body = "Name: $name\r\nEmail: $email\r\nPhone: $phone\r\nHow They Found Us: $find\r\n\r\nIp: $eip";
      mail($mymail,$name,$body,"From: $email\r\n");
      echo "<p>Thank you, $name!<br />Your request has been sent.</p>";}
  }

?>
  <form class="form" name="contact" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
    Name:*<br/>
    <input type="text" class="text" name="name"><br/>
    Email:*<br/>
    <input type="text" class="text" name="email"><br/>
    Phone:*<br/>
    <input type="text" class="text" name="phone"><br/>
    <div style="text-align:center;">How did you hear about us?</div>
	<select name="find" class="select">
	<option value="Choose" selected>Please select...</option>
	<option value="Magazine">Magazine</option>
    <option value="Radio">Radio</option>
    <option value="Newspaper">Newspaper</option>
	<option value="Other">Other...</option>
	</select>
    <input type="submit" name="esubmit" value="Send Mail" class="submit">
    <input type="hidden" name="eip" value="<?php echo $_SERVER["REMOTE_ADDR"]; ?>">
  </form>

The issue: when i submit the form it takes me to a “not found” page and the form does not get sent via email. I have used this form in other websites (not wordpress, but html created) and it always worked fine. Is there something different within wordpress that i must do? Thanks