need form help php5 on Windows

[sntsven]

I have been using a php script on a Unix server with no problems. I am now switching to a Windows server and trying to use the same script. I installed php5 on the Windows server. The php page called salestest.php comes up fine, but after you fill it out here is what comes up on the page that displays there input (this comes up after there input):

PHP Warning: mail() [function.mail]: "sendmail_from" not set in php.ini or custom "From:" header missing in C:\WebData\domainname\www\salestest.php on line 73

Here is the script I am using:

<?

// The email address to send form data to:
$TO_EMAIL_ADDRESS = "[e-mail]";
$SUBJECT = "Sales Question";

if (empty($_POST['form_submitted'])) {
show_form();
} else {
process_form($TO_EMAIL_ADDRESS, $SUBJECT);
}

////////////////////////////////////////////
// show_form
////////////////////////////////////////////

function show_form() {

global $PHP_SELF;

echo "
<font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\"><B>Sales</B></font><BR><BR>
<font face=\"Verdana,Tahoma,Helvetica\" size=\"1\"><BR>
<form method=post action=\"$PHP_SELF\">
<TABLE border=0>
<TR><TD><font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\">First Name: </font></TD><TD><input type=text name=firstname></TD></TR>
<TR><TD><font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\">Last Name: </font></TD><TD><input type=text name=lastname></TD></TR>
<TR><TD><font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\">Email Address:</font></TD><TD><input type=text name=email>*</TD></TR>
<TR><TD><font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\">Website URL:</font></TD><TD><input type=text name=websiteurl></TD></TR>
<TR><TD><font face=\"Verdana,Tahoma,Helvetica\" size=\"-1\">Sales Question</font></TD><TD><textarea name=question rows=\"5\" cols=\"50\"></textarea></TD></TR>
<TR><TD colspan=\"2\"></TD></TR>
<TR><TD></TD><TD>&nbsp;&nbsp;<input type=submit value=\"Submit\">
<input type=hidden name=form_submitted value=1></TD></TR>
</table>
</form>
</font>

";

}

////////////////////////////////////////////
// process_form
////////////////////////////////////////////

function process_form($to="", $subject="") {

$firstname = trim($_POST['firstname']);
$lastname = trim($_POST['lastname']);
$email = trim($_POST['email']);
$websiteurl = trim($_POST['websiteurl']);
$question = trim($_POST['question']);

$msg = "First Name: $firstname\nLast Name: $lastname\n\nEmail Address: $email\n\nWebsite URL: $websiteurl\n\nQuestion: $question";

$headers = "From: Domainname.net<[e-mail]>'"; 

mail($to, $subject, $msg, $headers); 

echo "Thank you for your question. This was sent to " .
"<b>$to</b><br>" .
"with your <b>$subject</b><br>" .
"We will reply asap.<br><BR><BR><b>" . nl2br($msg) . "</b>";

}
?>

I am new to setting up the php5 on a server but looked in the php.ini for the send_mail but not sure what to put there or if that is the issue. I want to use php for multiple sites so I don't want to modify the php.ini to be this site specific.
I would greatly appreciate any help.

[Installer]

You're probably going to need some site-specific stuff no matter what. You could put it all into an included file. Anyway, the manual page for mail specifies what needs to be set under Windows.

[sntsven]

hmmm...
ok so I am guessing that the script should be just fine.
I looked at the page recommended (http://www.php.net/manual/en/ref.mail.php) and its still a bit greek to me.
I am not quite sure what I am suppose to change and to what. I tried changing the

sendmail_from

to the address the php form is on but got the same result.
It says the

sendmail_path

is For Unix only so I didn't change that from the default which is blank.
Is this what I am suppose to change:

; For Win32 only.
;sendmail_from = [e-mail]

I am feeling so lost and the docs are rather confusing. I guess I am suppose to know more than I do but some of it just doesn't make sense. I don't where half the stuff is that I am suppose to find such as this:

PHP must have access to the sendmail binary on your system during compile time.

ANd:

PHP will first look for sendmail in your PATH, and then in the following: /usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib. It's highly recommended to have sendmail available from your PATH.

I don't know where to find that. But I don't even know if that is the issue.

[yelvington]

sendmail_from must be a valid email address on Windows.

The reason is that Windows does not include a mail transfer agent (such as sendmail or postfix on a Unix system).

An MTA will insert a default address if one is not supplied.

Since Windows does not include an MTA, you must give PHP the domain name or IP address of a mail relay (on another machine) that will serve in its stead.

That mail relay will not accept mail without a "From: " address. Hence the requirement.