Issue with 'From' header when sending SMS via PHP mail() function - php

Question

I'm using PHP's mail() function to send SMS messages. It works fine, except that the message shows as coming from 'myuser#mr2.websitewelcome.com' when I want it to show as 'test#mydomain.com'. Here's the relevant code:
//Set headers and send mail.
$headers = "From: " . "test#mydomain.com" . "\r\n";
$headers .= "Reply-To: ". "test#mydomain.com" . "\r\n";
mail( $from, '', $message, $headers );
I know this question has been asked before, but nothing has helped me so far. I've tried setting the header as '-f test#mydomain.com'. No luck.
Btw, if I send to an email address rather than a phone number, the headers work just fine.
Idk if this has anything to do with it, but my script gets called from an email forwarder that I set up in cpanel like:
Address Forward To
test#mydomain.com |/home/myuser/public_html/handler.php
Also, here are the full headers of an email send to an email address:
Return-Path: <itch3#mr2.websitewelcome.com>
Received: from gateway01.websitewelcome.com (gateway01.websitewelcome.com [67.18.65.19])
by mtain-mk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1B28B3800008B
for <myemail#me.com>; Wed, 8 Feb 2012 20:25:56 -0500 (EST)
Received: by gateway01.websitewelcome.com (Postfix, from userid 5007)
id A69B35C21D4BD; Wed, 8 Feb 2012 19:25:55 -0600 (CST)
Received: from mr2.websitewelcome.com (mr2.websitewelcome.com [74.53.229.178])
by gateway01.websitewelcome.com (Postfix) with ESMTP id 9CBAF5C21D49D
for <myemail#me.com>; Wed, 8 Feb 2012 19:25:55 -0600 (CST)
Received: from itch3 by mr2.websitewelcome.com with local (Exim 4.69)
(envelope-from <itch3#mr2.websitewelcome.com>)
id 1RvIln-0003AQ-Cv
for myemail#me.com; Wed, 08 Feb 2012 19:25:55 -0600
To: myemail#me.com
Subject: subject
From: "test#mydomain.com" <test#mydomain.com>
Reply-To: test#mydomain.com
Message-Id: <E1RvIln-0003AQ-Cv#mr2.websitewelcome.com>
Date: Wed, 08 Feb 2012 19:25:55 -0600
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - mr2.websitewelcome.com
X-AntiAbuse: Original Domain - aol.com
X-AntiAbuse: Originator/Caller UID/GID - [2146 32003] / [47 12]
X-AntiAbuse: Sender Address Domain - mr2.websitewelcome.com
X-BWhitelist: no
X-Source: /usr/bin/php
X-Source-Args: /usr/bin/php -q /home/itch3/public_html/handler.php
X-Source-Dir: switchon3.com:/public_html
X-Source-Sender:
X-Source-Auth: itch3
X-Email-Count: 2
X-Source-Cap: aXRjaDM7Y3ZncnViYnM7bXIyLndlYnNpdGV3ZWxjb21lLmNvbQ==
x-aol-global-disposition: G
X-AOL-SCOLL-SCORE: 0:2:199012208:93952408
X-AOL-SCOLL-URL_COUNT: 0
x-aol-sid: 3039ac1d61854f3320a4018d
X-AOL-IP: 67.18.65.19
X-AOL-SPF: domain : mr2.websitewelcome.com SPF : none

Answer 1

Can you use the additional parameters argument to (again) declare the from address?
mail('nobody#example.com', 'the subject', 'the message',
"From: webmaster#example.com\r\n", '-fwebmaster#example.com');
I generally add on the additional parameter when using mail() and it tends to fix most issues I've experienced.

Answer 2

You can set the Return-Path to test#mydomain.com, like so:
mail( $from, '', $message, $headers, '-ftest#mydomain.com');
(note the lack of space after -f)

Answer 3

The variable $from is not set, so it defaults. Your code should be:
//Set headers and send mail.
$headers = "From: " . "test#mydomain.com" . "\r\n";
$headers .= "Reply-To: ". "test#mydomain.com" . "\r\n";
$from = "test#mydomain.com";
mail( $from, '', $message, $headers );