SMF 2.0:
<?php
require_once('SSI.php');
echo '
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
	<title>Email</title>
</head>
<body>';

	$request = $smcFunc['db_query']('', '
		SELECT email_address, id_member
		FROM {db_prefix}members
		ORDER BY id_member',
		array()
	);
	$members = array();
	while ($row = $smcFunc['db_fetch_assoc']($request))
	{
		// Build the array.
		$members[] = array(
			'email' => $row['email_address']
		);
	}
	$smcFunc['db_free_result']($request);
	foreach ($members as $member)
	{
		echo $member['email'], '<br />';
	}
	echo '
</body>
</html>';

?>
SMF 1.x:
<?php
require_once('SSI.php');
echo '
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
	<title>Email</title>
</head>
<body>';

	$request = db_query("
		SELECT emailAddress, id_member
		FROM {$db_prefix}members
		ORDER BY ID_MEMBER", __FILE__, __LINE__);
	$members = array();
	while ($row = mysql_fetch_assoc($request))
	{
		// Build the array.
		$members[] = array(
			'email' => $row['emailAddress']
		);
	}
	mysql_free_result($request);
	foreach ($members as $member)
	{
		echo $member['email'], '<br />';
	}
	echo '
</body>
</html>';

?>