Guidelines on Electronic Mail Security

This document was developed in furtherance of NIST?s statutory responsibilities under the Federal Information Security Management Act (FISMA) of 2002, Public Law 107-347. The purpose of the publication is to recommend security practices for designing, implementing, and operating email systems on public and private networks. It contains information on popular email encryption standards and other standards relating to email. It presents general information on securing mail servers? operating systems and specific guidance on securing mail server applications, protecting messages traversing servers, and securing access to mailboxes. It also provides information regarding email client security and mail server administration.