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This feature implements the RFC draft draft-schmeing-smtp-priorities-04.txt.

Architecture

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 Trustedbird and a 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
...