EDIT 2: I'm aware of other alternatives (libraries) for email handling, but for the sake of my own curiosity and knowledge I just wish to know if this code is 100% good, or if it's buggy.

function Email($name, $from, $to, $subject, $message, $bcc = null, $attachments = null)
{
    ini_set('SMTP', 'localhost');
    ini_set('sendmail_from', $from);

    $name = filter_var($name, FILTER_SANITIZE_STRING);
    $from = filter_var($from, FILTER_SANITIZE_EMAIL);
    $subject = filter_var($subject, FILTER_SANITIZE_STRING);

    $boundary = '_Boundary_' . md5(microtime(true) . mt_rand(0, PHP_INT_MAX));

    $headers = array
    (
    	'MIME-Version: 1.0',
    	'Content-Type: multipart/mixed; boundary="Mixed' . $boundary . '"',
    	'Date: ' . date('r', time()),
    	'From: "' . $name . '" <' . $from . '>',
    	'Reply-To: "' . $name . '" <' . $from . '>',
    	'Return-Path: "' . $name . '" <' . $from . '>',
    	'X-Mailer: PHP ' . phpversion(),
    	'X-Priority: 2',
    	'X-MSMail-Priority: High',
    	'X-Originating-IP: ' . $_SERVER['SERVER_ADDR'],
    );

    if (is_null($to) === false)
    {
    	if (is_array($to) === false)
    	{
    		$to = explode(',', $to);
    	}

    	foreach ($to as $key => $value)
    	{
    		$to[$key] = filter_var($value, FILTER_SANITIZE_EMAIL);
    	}

    	$to = implode(', ', array_filter($to));
    }

    if (is_null($bcc) === false)
    {
    	if (is_array($bcc) === false)
    	{
    		$bcc = explode(',', $bcc);
    	}

    	foreach ($bcc as $key => $value)
    	{
    		$bcc[$key] = filter_var($value, FILTER_SANITIZE_EMAIL);
    	}

    	$headers[] = 'BCC: ' . implode(', ', array_filter($bcc));
    }

    if (is_null($attachments) === false)
    {
    	settype($attachments, 'array');

    	foreach ($attachments as $key => $value)
    	{
    		if (is_file($value) === true)
    		{
    			$attachments[$key] = array
    			(
    				'',
    				'--Mixed' . $boundary,
    				'Content-Type: application/octet-stream; name="' . basename($value) . '"',
    				'Content-Disposition: attachment; filename="' . basename($value) . '"',
    				'Content-Transfer-Encoding: base64',
    				'',
    				trim(chunk_split(base64_encode(file_get_contents($value)))),
    			);

    			$attachments[$key] = implode("\n", $attachments[$key]);
    		}

    		else
    		{
    			unset($attachments[$key]);
    		}
    	}

    	$attachments = implode("\n", $attachments) . "\n";
    }

    $message = array
    (
    	'This is a multi-part message in MIME format.',
    	'',
    	'--Mixed' . $boundary,
    	'Content-Type: multipart/alternative; boundary="Alt' . $boundary . '"',
    	'',
    	'--Alt' . $boundary,
    	'Content-Type: text/plain; charset="UTF-8"',
    	'Content-Disposition: inline',
    	'Content-Transfer-Encoding: 8bit',
    	'',
    	trim(strip_tags($message, '<a>')),
    	'',
    	'--Alt' . $boundary,
    	'Content-Type: text/html; charset="UTF-8"',
    	'Content-Disposition: inline',
    	'Content-Transfer-Encoding: 8bit',
    	'',
    	trim($message),
    	'',
    	'--Alt' . $boundary . '--',
    	$attachments,
    	'--Mixed' . $boundary . '--',
    );

    if (@mail($to, stripslashes($subject), implode("\n", $message), implode("\n", $headers)) === true)
    {
    	return true;
    }

    return false;
}