Here's the Simple PHP Form in action.

1. Download the PHP script - once downloaded, copy and paste
the PHP code of Jack's FormMail.php script into notepad (not MS Word)
and save it as securemail.php (not formmail.php - this will
make it a more secure form)

 http://www.dtheatre.com/scripts/formmail

2. Edit Recipient Field - the recipient field allows you to specify to
whom you wish for your form results to be mailed. For Multiple Recipients
separate the email addresses with commas (",").

 $recipient = "info@domain.com, steve@domain.com";

Note: If you use this option you cannot use recipient in your html form i.e.

<input type=hidden name="recipient" value="info@yourdomain.com">

If you already inserted this in your html form, then simply delete it.
This will prevent spammers from harvesting your email address
because it now can't be found on your html form.

3. Edit the referrers field - the only recommended field to edit in
the script is the "referers" field. This field defines the domains that allow
forms to reside on and use your securemail.php script. If you try
to put the form on another server, that is not the specified
domain or ip, you will receive an error message when someone
tries to fill it out. 

ie: $referers = array ('ihost-websites.com','www.ihost-websites.com','209.123.240.161');

4. Upload the securemail.php script to the root directory of your server
(same location as your index.html file).

Note: Make sure you upload the php script in ASCII mode. This is
because it is a text file. You will get errors if you upload it in binary mode.

5. Create your HTML form - create a web page (ie contact.htm)
that contains your html form (see example html form below).

6. Point the action of your form to the securemail.php script you 
downloaded in Step 1.

ie: <form name="form mail" method="post" 
action="http://www.ihost-websites.com/securemail.php"> 

7. Add optional form fields 

"subject field" - this allows you to specify the subject that
you wish to appear in the e-mail that is sent to you after this
form has been filled out. If you do not have this option turned
on, then the script will default to a message subject: "Form
Submission". 

ie: <input type=hidden name="subject" value="Form
Mail Results"> 

"full name field" - this allows visitors to fill in their name.
This will help you to personalize your return email by
including their first and/or last names. 

i.e: <input type=text name="fullname"> 

"email address field" - this allows you to specify your return
e-mail address. If you want to be able to return e-mail to your
user, I strongly suggest that you include this form field and
allow them to fill it in. This will be put into the From: field
of the message you receive. The email address submitted will be
checked for validity. 

i.e: <input type=text name="email"> 

"comments field" - this allows visitors to add any comments in
your form. You could name this field anything you like. 

ie: <textarea name="comments"></textarea> 

"required field" - these are the required fields you want your
visitors to fill in before they can successfully submit the
form. If the required fields are not filled in, the visitor
will be notified of what they need to fill in, and a link back
to the form they just submitted will be provided. 

ie: <input type=hidden name="required" value="fullname,email"> 

"redirect field" - if you wish to redirect the visitor to a
different URL, rather than having them see the default response
to the fill-out form, you can use this hidden variable to send
them to a pre-made HTML (ie thankyou.htm) page. 

ie: <input type=hidden name="redirect" 
value="http://www.ihost-websites.com/thankyou.htm"> 

"submit field" - this allows the visitor to submit the form 

ie: <input type="submit" name="Submit" value="Submit"> 

8. Create a thank you page (thankyou.htm) - this web page will 
automatically thank visitors for subscribing. Add your own
comments you wish them to receive. Upload this web page to your
server. 

Tip: Use your own domain name, email and IP address in the
fields above. 

Here's an example of a typical web page using the PHP form.
(http://www.ihost-websites.com/contact.htm) 

All the fields are included as was discussed above: 

<html>
<head>
<title>Form Mail</title> 
</head>

<body bgcolor="#FFFFFF" text="#000000"> <form name="form1"
method="post" action="http://ihost-websites.com/securemail.php">

<input type=hidden name="subject" value="Form Mail Results"> 

<input type=hidden name="required" value="fullname,email">

<input type=hidden name="redirect" 
value="http://www.ihost-websites.com/thankyou.htm">

Name<br><input type=text name="fullname"><br>

Email<br> <input type=text name="email"><br>

<br> Comments<br> <textarea name="comments"></textarea> <br>

<br> <input type="submit" name="Submit" value="Submit">

</form>

</body>
</html> 

9. Copy and paste this html form into your web page - name it
anything you like (ie contact.htm), then upload it to your
server. 

10. Test out your form - when you fill out the form, you should
immediately receive the reply from your thankyou.htm page
and receive the form results in your email box. 

Conclusion - you now have a fully functional and flexible PHP
form on your web site to collect visitor information. You can
add more fields to the form if necessary. You may also add any
number of HTML forms to your web site and still use the same
PHP script. 

Resources 

Jack's PHP FormMail

Help/Support - PHP Form Forum