Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

NIST SP 800-177

Trustworthy Email

Date Published: September 2016


Scott Rose (NIST), Stephen Nightingale (NIST), Simson Garfinkel (NIST), Ramaswamy Chandramouli (NIST)



Simple Mail Transfer Protocol (SMTP); Transport Layer Security (TLS); Sender Policy Framework (SPF); Domain Keys Identified Mail (DKIM); Domain based Message Authentication, Reporting and Conformance (DMARC); Domain Name System (DNS)Authentication of Named Entities (DANE); S/MIME; Email; OpenPGP
Control Families

System and Communications Protection


Download URL

Supplemental Material:
High Assurance Domains project

Related NIST Publications:
SP 1800-6
SP 800-45 Version 2
ITL Bulletin

Document History:
03/30/16: SP 800-177 (Draft)
09/07/16: SP 800-177 (Final)