I am so sick of having to clear out spam messages from my inbox. If I am away from my computer for even a weekend there are over a 100 unsolicited and unwanted messages jamming my it. I was thinking, would it be possible to have a mailbox system that automatically rejects all incoming messages from everyone EXCEPT from those addresses which the user programs the mailbox to accept. Like the CRM-114 gizmo in Dr. Strangelove. I don't see anything that technically difficult in this.