PHP mail function: how to affect the Return-Path parameter

From a web-based script within a hosting account, i want to send an email from a PHP script.
Everything works fine, except the Return-Path seems to always be the system default (in the system php.ini)
How can i change this on a per user or per script basis?

I tried the suggestion   From:  First LastName<email@domain.com>
which comes thru fine as the From address in the message header, but the Return-Path in the header
still says   nobody@myserver.com

any advice?
willsherwoodAsked:
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bansidharConnect With a Mentor Commented:
try using

mail('nobody@example.com', 'the subject', 'the message', 'additional headers',  '-fwebmaster@yourdomain.com');

this works if your MTA is sendmail
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willsherwoodAuthor Commented:
this seems only to affect the From address, not the Return-Path
address listed in the headers.

I even tried putting a php.ini in the root of the user account  (however, when i run  phpinfo.php
it shows:
sendmail_from      no value    )

so maybe that should be my question.
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bansidharCommented:
try also adding Return-Path: <webmaster@yourdomain.com> to the additional header like

mail('nobody@example.com', 'the subject', 'the message', "Return-Path: <webmaster@yourdomain.com>\n",  '-fwebmaster@yourdomain.com');

but the first method I suggested have to work with sendmail the last parameter is the option for sendmail. This requires that your send mail can send mails using the email address you are providing.

check for the sendmail details here
http://www.courier-mta.org/sendmail.html
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willsherwoodAuthor Commented:
sorry, but i'm already in a custom script and am using the built-in PHP mail() function directly.
(It has nothing to do with a webform or the traditional sendmail or formmail type of feature)

I need to know how to set the value that is contained in the message header for  Return-path.
It's currently picking up the default server email address as defined in (Cpanel) WHM root.

I've tried putting     Return-path:     as an additional parameter in the  header string given to the mail() function,  and i've tried (quickly/temporarily) changing the php.ini file for the entire server, and neither of these techniques affect the  resulting  Return-path in a received message header.   (I did verify in phpinfo.php that the sendmail_from  was affected  in this latter test)
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willsherwoodAuthor Commented:
thanks
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