NIST SP 800-45 Guidelines on Electronic Mail Security advises on the installation, configuration and maintenance of secure email servers and clients. It presents recommendations to secure mail server operating systems and applications, protect mail servers, administer mail servers securely plus advice on protecting individual emails and securing mailbox access. The email security standard is a revised version of the original 2002 standard. Other newly-released NIST standards cover intrusion detection and prevention (SP 800-94), and securing 802.11i wireless networks (SP 800-97).
More email security, web/network security and wireless network security links