[Users] Headers

Johan Vromans jvromans at squirrel.nl
Wed Sep 30 08:51:50 CEST 2015

On Wed, 30 Sep 2015 08:38:00 +0200
"Felipe T. Dorado" <ftdorado at ono.com> wrote:

> Ctrl+U gives us the source of the present message. 

Ctrl+H will show you the headers in the message view.

> Where can I find the exact meaning of all the klutches (?) listed in the
> header of the source? 

The official headers are defined in RFC2822. Amongst these are:

> Date: 
> From: 
> To: 
> Bcc: 
> Subject: 
> Message-ID:
> In-Reply-To:
> References: 
> Mime-Version: 1.0
> Content-Type: text/plain; charset=ISO-8859-15
> Content-Transfer-Encoding: quoted-printable

User agents (MUA, like Claws) and transport systems (MTA, like sendmail)
and virus scanners add their own headers, all prefixed with X- :

> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; i486-pc-linux-gnu)

But all of the other headers (non X-...) should not be there since they
violate RFC2822. I've never seen them anywhere...


-- Johan

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