WP 3.4 email confirmation fix

This is probably covered somewhere else, so feel free to delete this post if so.

For those who are no longer receiving notification emails after the WordPress 3.4 update, open the following file:
/wp-includes/class-phpmailer.php

and change line 763 from:

$rt = @mail($val, $this->EncodeHeader($this->SecureHeader($this->Subject)), $body, $header, $params);

to this:

$rt = @mail($val, $this->EncodeHeader($this->SecureHeader($this->Subject)), $body, $header);

and also line 769 from:

$rt = @mail($to, $this->EncodeHeader($this->SecureHeader($this->Subject)), $body, $header, $params);

to this:

$rt = @mail($to, $this->EncodeHeader($this->SecureHeader($this->Subject)), $body, $header);

Lots of contact form plugins also not working. How on earth did the beta testers miss this?