Cool! But it would be even better if that is a separate checkbox altogether.I also reworked the the dropbox in order to prevent players from spamming the list of recipients with multiple mailboxes. To list (or unlist) your mailbox, simply toggle the "Delivery Notification" option in the mailbox GUI.
Players can not possibly from the label "Delivery Notification" that this *also* hides the mailbox from dropboxes. It does not make sense. It's essentially a secret feature.
A separate checkbox for hiding would probably the best solution. Either that, or change the checkbox label to "Delivery Notification and Hide from Dropboxes". But I would really like to have those two features to be separated. I don't want to sacrifice the delivery notification in order to hide the mailbox from dropboxes. :P
To be honest, I'm still not sure what this strange "Bitmak Mask" thing actually does and what exactly happens when I click "Lock" or "Unlock". Besides, "Bitmap Mask" is a really weird wording, please don't confuse players with hacker language. :P The word "Lock" doesn't even make sense to me, because a shared protector already locks all nodes. So there's nothing the protector could possibly lock even more, right?
Finally: Secret spears and pickaxes detected! :D