php form not emailing

[system]

I have a website I’m trying to insert a form on, but even when I copy a form that I know works (it is live and currently emailing works) over to this site (both the html with the form on it, and the php file that has the form process php), and then it won’t email. Is there any reason why this would happen?

Here is the code, FYI:

HTML:
[php]

First Name*	Last Name*
Street Address*
City*	State/Province*	Zip/Postal Code*
Email Address*	Phone
Comments

Asterisk(*) = Required [/php]

PHP (on contact_process.php):
[php]<?php
if (isset($_POST[“submit_button”])) {

    $recipient = "[email protected]";
    $subject = "Contact us "; //. $_POST["requesttype"]." request...";
    $header = "From: Server <[email protected]>\n"."Reply-To: [email protected]\n";

    $content = "Contact Us ". $_POST["requesttype"]." Submission
		First name: ". $_POST["name"] ."
		Last name: ". $_POST["lastname"] ."
		Company: ". $_POST["company"] ."
		Street Address: ". $_POST["street"]. "
		City: ". $_POST["city"]. "
		State/Province: ". $_POST["state"]. "
		Zip: ". $_POST["zip"]. "
		E-Mail: ". $_POST["email"]. "
		Phone: ". $_POST["phone"]. "
		Comments: ". $_POST["comments"]. "
                    Linking page: ". $_SERVER['HTTP_REFERER'];
    mail($recipient, $subject, $content, $header);

}

?>[/php]

[JimL]

Have you checked that the mail function actually works on the server?

I would suggest changing to a better library that offers error checking, etc.

PHPMailer/PHPMailer