(页面存档备份,存于互联网档案馆) - an organization devoted to privacy and intellectual freedom advocacy Expectation of privacy for company email not deemed objectively reasonable
[2016-08-06]. (原始内容存档于2016-07-30). 5 of the Best Secure Email Services for Better Privacy. maketecheasier. 23 October 2015 [13 March 2017]. (原始内容存档于2017-12-13)
The Man Who Invented Email. Time Magazine: Techland. 15 November 2011 [11 June 2012]. (原始内容存档于2014-07-02). Email Right to Privacy – Why Small Businesses
PGP(英語:Pretty Good Privacy,直譯:优良保密协议)是一套用于讯息加密、验证的应用程式。 PGP的主要开发者是菲尔·齐默曼。齐默曼于1991年将PGP在互联网上免费发布。PGP本身是商业应用程序;开源并具有同类功能的工具名为GnuPG(GPG)。PGP及其同类产品均遵守OpenPGP数据加解密标准(RFC