There doesn't seem to be a search for this bug tracker, so I hope this hasn't already been reported...

Emails are not being sent with proper (RFC 2822, [url=
http://php.net/manual/en/function.mail.phpphp.net:" target="_blank] mail[/url]) line feeds: they only contain \n (LF), when they should use \r\n (CRLF).

A side-effect is that on Windows platforms, are getting sent as if all the text it contains is on one big long line. This makes the email difficult to read, and screws up any links contained within them.

Let me know if there is any futher info you need.