1) When you save emails from Thunderbird's 'sentbox', they're not recognized as emails but as text/plain. But messages saved in Thunderbird from any other folder than 'sent' are seen as message/rfc822, which is IMHO the correct MIME type.

Is that a Thunderbird bug or a too strict pattern in fd.o.xml?

2) Evolution saved messages always appear as application/mbox.

Regarding the message saved from 'sentbox' in TB and an Evo message, the difference is apparently that Evolution adds a 'From' and date line at the top of the file, and it appears as application/mbox. 

Same question: is it normal that the Evo messages are detected as mailboxes and not messages? To me finally only the TB messages not from 'sentbox' look correct, or properly detected.

Thanks



See attached files for complete reference (tags from Evolution are here because I read them first with Evo, not because I saved them with it).
Here's the structure of the headers:
* message-rfc822 file from TB:
Received:
Date:
From:
User-Agent:
MIME-Version: 1.0
To:
Subject:
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable

* application/mbox file from Evo:
From user1@server.net Fri Apr 25 22:12:15 2008
Subject: 
From: 
To: 
Cc: 
In-Reply-To: 
References: 
Content-Type: text/plain; charset=utf-8
Message-Id: 
Mime-Version: 1.0
X-Mailer: Evolution 2.22.1 
Date: Fri, 25 Apr 2008 22:12:15 +0200
X-Evolution-Format: text/plain
Content-Transfer-Encoding: 8bit

* text/plain file from TB:
Subject: 
From: 
To: 
Cc: 
In-Reply-To: 
References: 
Content-Type: text/plain; charset=utf-8
Message-Id:
Mime-Version: 1.0
X-Mailer: Evolution 2.22.1 
Date: Fri, 25 Apr 2008 22:12:15 +0200
X-Evolution-Format: text/plain
Content-Transfer-Encoding: quoted-printable