Where is the safe sender list for my email?

Would it be feasible to engineer a way for an email sender to change the list of recipients from cc: to bcc:?

• As an office email chain about a ping-pong tournament spirals into madness, I have to wonder -- is it possible to create an 'oops' button of sorts, so if you forget to put all the recipients of an email under bcc, you can move them there after the fact? What remedy is there, other than pleading for people not to reply-all?

• Answer:

  I'm not sure if this works entirely, but one option you have is to send out a second email (this time using bcc) adding some trivial additional information. If they have threading, they'll likely reply to your most recent email without even noticing that the original email was sent using cc.