er, use the pear mail classes! Here's a working example for ya:
$mail_text = "Results from import: $ok_rows row(s) ok, $errored_rows row(s) with errors.
";
if ($errored_rows) $mail_text .= "\nThe errored rows are attached.";
// Create mail message
$mime = Mail::factory('mime', '');
$mime->setTXTBody($mail_text);
$mime->setHTMLBody(nl2br($mail_text));
// Link files
if ($errored_rows) $mime->addAttachment('error_data.log');
$mime->addAttachment('results.log');
$mailBody =& $mime->get();
$mailHeaders =& $mime->headers();
$mailHeaders['Subject'] = 'Import Results';
$mail = Mail::factory('mail');
$mail->send($emailTo, $mailHeaders, $mailBody);