A Simple Email Message Example

PKI Tutorials - Herong's Tutorial Examples

∟S/MIME and Email Security

∟A Simple Email Message Example

This section provides a simple email message example without using the MIME (Multipurpose Internet Mail Extensions) protocol.

The most common use of S/MIME is secure emails. To understand how S/MIME can be used to secure emails, I want to show you how a simple email message looks like, when it is delivered over the Internet.

Here is an example email message copied from an article on about.com:

Received: by sphinx (mbox mlande) (with Cubic Circle's cucipop (v1...
X-From_: bob@internet.com Wed Aug 20 19:40:22 2003
Return-Path: <bob@internet.com>
Received: from psmtp.com (exprod5mx37.postini.com [12.158.34.194])...
Message-Id: <200308210240.h7L2e5A0016623@sphinx.got.net>
Received: from source ([69.9.251.177]) by exprod5mx37.postini.com ...
From: "Bob Example" <bob@internet.com>
To: "Alice Example" <alice@internet.com>
Date: Wed, 20 Aug 2003 16:02:43 -0500
Subject: Test message

Hello Alice.
This is a test message with some header fields and 5 lines in the
message body.
Your friend,
Bob

Notice that MIME (Multipurpose Internet Mail Extensions) protocol is not used in this simple email message.

Table of Contents

About This Book

Introduction of PKI (Public Key Infrastructure)

Introduction of HTTPS (Hypertext Transfer Protocol Secure)

Using HTTPS with Google Chrome

Using HTTPS with Mozilla Firefox

HTTPS with Microsoft Edge

Using HTTPS with Apple Safari

HTTPS with IE (Internet Explorer)

Android and Server Certificate

iPhone and Server Certificate

Windows Certificate Stores and Console

RDP (Remote Desktop Protocol) and Server Certificate

macOS Certificate Stores and Keychain Access

Perl Scripts Communicating with HTTPS Servers

PHP Scripts Communicating with HTTPS Servers

Java Programs Communicating with HTTPS Servers

.NET Programs Communicating with HTTPS Servers

CAcert.org - Root CA Offering Free Certificates

PKI CA Administration - Issuing Certificates

Comodo Free Personal Certificate

Digital Signature - Microsoft Word

Digital Signature - OpenOffice.org 3

►S/MIME and Email Security

Digital Signature Scheme for Email Messages

►A Simple Email Message Example

Email Messages with Attachments using MIME

Email Messages with Digital Signatures using S/MIME

Encrypted Email Messages using S/MIME

Digital Signature and Encryption in Outlook

Email Security Settings in Outlook

Valid Certificate Required in Outlook

Message Security Properties in Outlook 2007

Firefox Extension - Gmail S/MIME

PKI (Public Key Infrastructure) Terminology

Archived Tutorials

Full Version in PDF/EPUB