Ubuntu Servers :: HTML PHP Email Configuration / Squirrelmail Setup

I'm having problems with emails containing HTML content. When Google downloads the email messages via POP3 from my squirrelmail server, the message does not display using HTML. I'm not sure if this is Google's fault or Squirrelmail's fault, but I've never had problems before on other servers running the same script and using squirrelmail. If I login to squirrelmail, I have the option to download the email message as an attachment. The attachment, if opened by my local browser, shows up as HTML content, and it is properly formatted. However, I'm using Google to download my emails and file them under my Gmail account. After Gmail downloads the messages, it shows up like this:

From
To admin@domainRemoved.com
Date Sat, Jul 30, 2011 at 6:07 PM
Subject Pending Registration

Content-type: text/html; charset=iso-8859-1
From: Name Removed <admin@domainRemoved.com>
Message-Id: <20110730234302.6B6FEDC08BA@eric-desktop>
Date: Sat, 30 Jul 2011 17:43:02 -0600 (MDT)

<p><b> After registering your client via your server, please visit the following URL to send them confirmation: </b></p>

I really need it to show up properly once Gmail downloads the messages, as it takes a long time to login to Squirrel mail and download each message as an attachment. My PHP Code Headers Look like this:
$headers = 'MIME-Version: 1.0' . " ";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . " ";
$headers .= "From: $uname <$email>";

Someone suggested that I remove the from my script. I did, and now the email shows a from sender as www-data www-data@domain.com. Before, the from field showed up as empty. However, my PHP script is designed to change the sender's information to the clients that contact me. Thus, if customer A contacts me, the email should be from customer A <custa@whatever.com>. However, it's not being changed by the PHP script. It works on every other server but mine. I think my postfix configuration isn't setup properly? What needs to be configured on it?