"And we also built in a website address so that if somebody decodes the code within the code, they can send an e-mail to that address.

VOA: special.2010.07.20

Inter-office mail is code 37, intra-office mail 37-3, outside mail is 3-37.

FORBES: Ernst & Young Outline New Vision of Patient-Centric Healthcare

One big area for expansion: presorting, or arranging mail by ZIP code, to get a break on postal rates.

FORBES: Delivery Problems

The bad guys are increasingly using social media to try to find a way in, either by gathering intelligence or by befriending employees who may be tricked into opening an e-mail with nasty code within.

ECONOMIST: Businesses and cyber-security