WordPress MU

There are some mail server, that reject the messages from WordPress.
The problem is this: http://cr.yp.to/docs/smtplf.html

I change the
return @mail($to, $subject, $message, $headers);
to
return @mail($to, $subject, str_replace("\n", "\r\n", str_replace("\r\n", "\n", $message)), str_replace("\n", "\r\n", str_replace("\r\n", "\n", $headers)));

in wp-includes\pluggable.php

Emails are being rejected because they're being labeled as being sent by the PHP mailer, not the normal STMP server.

Ticket made though:

http://trac.mu.wordpress.org/ticket/158

Ok, thank you.