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> User Manual > Feature: Handling priority at the envelope level > Technical Documentation

Sommaire 1 Feature: Handling priority at the envelope level - Technical Documentation 1.1 Implementation 1.1.1 Specifications 1.1.2 Architecture 1.1.2.1 Synthetic presentation of the architecture of the extension 1.1.2.2 GUI files 1.1.2.3 XPCOM files 1.1.3 Network communication

Feature: Handling priority at the envelope level - Technical Documentation

This feature uses the PRIORITY extension of a MTA (Mail Transfer Agent). It provides the ability to define a priority for a message.

5 levels of priority are defined:

• 0 - NONE
• 1 - ROUTINE
• 2 - PRIORITY
• 3 - IMMEDIATE
• 4 - FLASH

Implementation

Specifications

The reference for the implementation of this functionality is the RFC draft: draft-schmeing-smtp-priorities-04.txt.

Architecture

Synthetic presentation of the architecture of the extension

This functionality is integrated to the source code of Thunderbird, without relaying on an extension.

GUI files

The GUI has been updated so that the user can choose the priority level for the current message:

The choice of the user is encapsulated in a nsIMsgCompFields object. This objet is then forwarded to the XPCOM layer, which handles the request.

XPCOM files

The addition of the priority feature is implemented by modifying existing XPCOM classes.

Network communication

Example of a dialog between Milimail client and SMTP server supporting "PRIORITY" feature:

> EHLO [1.2.3.4]
< 250-test.milimail.org
< 250-PIPELINING
< 250-STARTTLS
< 250-PRIORITY
> MAIL FROM:<user1@test.milimail.org>
< 250 2.1.0 Ok
> RCPT TO:<user2@test.milimail.org> PRIORITY=2
< 250 2.1.5 Ok
> DATA
...

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