Confusing Problem With Email Delivery From My Site to AOL / Others

The confirmation emails sent from my website http://earthlandrealms.com when users sign up isn't being delivered to aol.com address's and some other email providers. The strange thing is if I send the same exact email manually using the web based email program Horde, on the same server, using the same email address, it gets delivered. Both Horde and the page sending the email are PHP. The only thing I can think of is that maybe the code is wrong somehow even though the emails do get delivered to gmail and others. Here's the code:

$ism=mail($cgi['email'],"EarthlandRealms.com Activation e-mail","Welcome to Earthland Realms! \n Your username is: {$cgi['username']} \n Your activation password is {$pas} \n\nEarthlandRealms.com", "From: noreply@dontspamme.com");

PHP:

Any ideas?

 

I believe AOL blocks all emails sending by script likes that. AOL can check the header, and if it could not find out a correct mail server, it will block email without question

 

By why is the same email sent through Horde (a php script) delivered, but the one sent through the confirmation script not delivered (also php script, same from address)? What is Horde doing that the confirmation script is not?

 

because horde uses smtp

 

AOL needs some headers that other mail carriers may not in order to process incoming e-mail properly, in my experience. Here's what works for me:

$headers = "";
	$headers .= "From: $EMAIL_FROM<$EMAIL_FROM>\n";
	$headers .= "Reply-To: <$EMAIL_FROM>\n";
	$headers .= "X-Sender: <$EMAIL_FROM>\n";
	$headers .= "X-Mailer: PHP4\n"; //mailer
	$headers .= "X-Priority: 3\n"; //1 UrgentMessage, 3 Normal
	$headers .= "Return-Path: <$EMAIL_FROM>\n";
	$headers .= "Content-Type: text/html; charset=iso-8859-1\n";
	mail($EMAIL_TO,$EMAIL_SUBJECT,$EMAIL_TEXT,$headers);

Code (markup):

Jason

 

It works! AOL users can finally signup. Thanks!

 

Yer welcome