"Originally to" is empty

Hi,

Don't know if this is a bug or tied to my php installation. I develop myself (not php though) and cannot find anything wrong with the code as I see no difference between line 1 & 2

$msg[] = t("Mail key: @key", array('@key' => $mailkey));
$msg[] = t("Originally to: <@to>", array('@to' => $to));
$msg[] = t("Originally to hack: <@to>") . $to;

However line 2 will not work.
Line 3 does work however.

I promise to pick up drupal patching when I have this deadline done!