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To use php's mail function, you don't need to actually have the email you are saying you are sending from.

 

For example:

$to = "someone@example.com";
$subject = "Test mail";
$message = "Hello! This is a simple email message.";
$from = "someonelse@example.com";
$headers = "From: $from";
mail($to,$subject,$message,$headers);
echo "Mail Sent.";

 

you dont need to actually have someonelse@example.com setup, it just says its from them.

 

Look here for more: http://www.w3schools.com/php/php_mail.asp

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<?php
require_once('db.php');
include('functions.php');

if(isset($_POST['register']))
{
	if($_POST['username']!='' && $_POST['password']!='' && $_POST['password']==$_POST['password_confirmed'] && $_POST['email']!='' && valid_email($_POST['email'])==TRUE && checkUnique('Username', $_POST['username'])==TRUE && checkUnique('Email', $_POST['email'])==TRUE) 
	{

		$query = mysql_query("INSERT INTO users (`Username` , `Password`, `Email`, `Random_key`) VALUES ('".mysql_real_escape_string($_POST['username'])."', '".mysql_real_escape_string(md5($_POST['password']))."', '".mysql_real_escape_string($_POST['email'])."', '".random_string('alnum', 32)."')") or die(mysql_error());

		$getUser = mysql_query("SELECT ID, Username, Email, Random_key FROM users WHERE Username = '".mysql_real_escape_string($_POST['username'])."'") or die(mysql_error());

		if(mysql_num_rows($getUser)==1)
		{//there's only one MATRIX :PP

			$row = mysql_fetch_assoc($getUser);
			$headers = 	'From: webmaster@ourdomainhere.com' . "\r\n" .
    					'Reply-To: webmaster@ourdomainhere.com' . "\r\n" .
    					'X-Mailer: PHP/' . phpversion();
			$subject = "Activation email from ourdomainhere.com";
			$message = "Dear ".$row['Username'].", this is your activation link to join our website. In order to confirm your membership please click on the following link: http://www.ourdomainhere.com/confirm.php?ID=".$row['ID']."&key=".$row['Random_key']." Thank you for joining";
			if(mail($row['Email'], $subject, $message, $headers))
			{//we show the good guy only in one case and the bad one for the rest.
				$msg = 'Account created. Please login to the email you provided during registration and confirm your membership.';
			}
			else {
				$error = 'I created the account but failed sending the validation email out. Please inform my boss about this cancer of mine';
			}
		}
		else {
			$error = 'You just made possible the old guy (the impossible). Please inform my boss in order to give you the price for this.';
		}

	}
	else {		
		$error = 'There was an error in your data. Please make sure you filled in all the required data, you provided a valid email address and that the password fields match';	
	}
}
?>
<?php if(isset($error)){ echo $error;}?>
<?php if(isset($msg)){ echo $msg;} else {//if we have a mesage we don't need this form again.?>
<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
Username: <input type="text" id="username" name="username" size="32" value="<?php if(isset($_POST['username'])){echo $_POST['username'];}?>" /><br />
Password: <input type="password" id="password" name="password" size="32" value="" /><br />
Re-password: <input type="password" id="password_confirmed" name="password_confirmed" size="32" value="" /><br />
Email: <input type="text" id="email" name="email" size="32" value="<?php if(isset($_POST['email'])){echo $_POST['email'];}?>" /><br />
<input type="submit" name="register" value="register" /><br />
</form>
<? } ?>

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