PKI Tutorials - Herong's Tutorial Examples - v2.32, by Herong Yang
Email Messages with Attachments using MIME
This section provides an email message example with an attachment using the MIME (Multipurpose Internet Mail Extensions) protocol. The message is divided into multiple parts with each part using different content type.
If you want to send email message with an attachment, you email program will use the MIME (Multipurpose Internet Mail Extensions) protocol to deliver your message together with the attachment.
Here is an example email message using MIME to delivery a picture as an attachment:
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 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="XXXXboundary text" This is a multipart message in MIME format. --XXXXboundary text Content-Type: text/plain Hello Alice. This is a test message with 5 lines in the message body and an attachment. Your friend, Bob --XXXXboundary text Content-Type: image/gif Content-Transfer-Encoding: Base64 Content-Disposition: attachment; filename=smile.gif /9j/4AAQSkZJRgABAQEAYABgAAD/4QAWRXhpZgAASUkqAAgAAAAAAAAAAAD/2wBDAA... BwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PT... ... X/76NHnS/wDPV/8Avo0f2Nh+7+9f5B/aNXsv6+Z//9k= --XXXXboundary text--
Note that:
Table of Contents
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 IE (Internet Explorer)
Android 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
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