Form Configuration 
The action of your form needs to point towards this script (obviously), and the method must be POST or GET in capital letters. Version 1.5 of FormMail offers many new ways to code your form to tailor the resulting HTML page and the way the script performs. Below is a list of form fields you can use and how to implement them.

Necessary Form Fields
There is only one form field that you must have in your form, for FormMail to work correctly. This is the recipient field.

Field:  recipient 
Description:  This form field allows you to specify to whom you wish for your form results to be mailed. Most likely you will want to configure this option as a hidden form field with a value equal to that of your e-mail address.

You can include multiple recipients by separating the values with commas. 
Syntax: <input type=hidden name="recipient" value="email@your.host.com"> OR
<input type=hidden name="recipient" value="user@yourhost.com,user2@yourhost.com">
NOTE These MUST be addresses in your control panel, if you want to forward off to another address, create a forward in your control panel.  

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Optional Form Fields
Field:  subject 
Description:  The subject field will allow 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: WWW Form Submission. 
Syntax:  If you wish to choose what the subject is:
<input type=hidden name="subject" value="Your Subject">

To allow the user to choose a subject:
<input type=text name="subject">  

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Field:  email 
Description:  This form field will allow the user to specify their 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. If you want to require an email address with valid syntax, add this field name to the required field. 
Syntax:  <input type=text name="email"> 

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Field:  realname 
Description:  The realname form field will allow the user to input their real name. This field is useful for identification purposes and will also be put into the From: line of your message header. 
Syntax:  <input type=text name="realname"> 

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Field:  redirect 
Description:  If you wish to redirect the user 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 page. 
Syntax:  To choose the URL they will end up at:
<input type=hidden name="redirect" value="http://your.host.com/to/file.html">

To allow them to specify a URL they wish to travel to once the form is filled out:
<input type=text name="redirect"> 

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Field:  required 
Description:  You can now require for certain fields in your form to be filled in before the user can successfully submit the form. Simply place all field names that you want to be mandatory into this field. If the required fields are not filled in, the user will be notified of what they need to fill in, and a link back to the form they just submitted will be provided.

To use a customized error page, see missing_fields_redirect 
Syntax:  If you want to require that they fill in the email and phone fields in your form, so that you can reach them once you have received the mail, use a syntax like:
<input type=hidden name="required" value="email,phone"> 


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<form method="POST" action="cgi-sys/formmail.cgi">
<input type="hidden" name="recipient" value="email@mydomain.co.za">
<input type="hidden" name="subject" value="Order Request">
<input type="hidden" name="required" value="realname,username,phone">


Please Enter Your Name:<br>
<input name="realname" size="40">
<br>
Please Enter Your Email Address:<br>
<input name="username" size="40">
<br>
Please Enter Your Phone Number:<br>
<input name="phone" size="40">
<br>
Add Additional Fields Here
<input type="submit" value="Submit">
<input type="reset" value="Reset">
</form>


This is what your output would be (this example form will do nothing)
Please Enter your name

Please Enter Your Email Address:

Please Enter Your Phone Number:

subject = specify the subject included in e-mail sent back to you
email = allow the user to specify a return e-mail address
realname = allow the user to input their real name
redirect = URL of page to redirect to instead of echoing form input
required = list of field names that are required input (comma delimited)

More information is available here http://www.scriptarchive.com/readme/formmail.html