Add "Received:" header to email msg in correct position?

[Grant Edwards]

On 2014-05-06, Burak Arslan <burak.arslan at arskom.com.tr> wrote:
>
> On 05/06/14 12:47, Chris Angelico wrote:
>> On Tue, May 6, 2014 at 7:15 PM, alister
>> <alister.nospam.ware at ntlworld.com> wrote:
>>> On Mon, 05 May 2014 19:51:15 +0000, Grant Edwards wrote:
>>>
>>>> I'm working on a Python app that receives an e-mail message via SMTP,
>>>> does some trivial processing on it, and forwards it to another SMTP
>>>> server.
>>>>
>>>> I'd like to do the polite thing and add a "Received:" header, but I
>>>> can't figure out how to get Python's email module to add it in the
>>>> correct place.  It always ends up at the "bottom" of the headers below
>>>> From: To: etc.  It's supposed to go at the above all the Received:
>>>> headers that where there when I received it.
>>
>>> Is this required or just being polite?
>>> what I mean is does the standard state the headers must be in a
>>> particular order or can they appear anywhere, you may be spending time
>>> trying to resolve an issue that does not need fixing.
>> Yes, it's required. RFC 2821 [1] section 3.8.2 says "prepend".
>
> The rationale for "prepend" is to make it possible for MTAs to add
> their "Received:" headers to messages without having to parse them.
>
> So you're supposed to do the same: Just write your Received header,
> followed by '\r\n', followed by the rest of the message to the socket
> and you should be fine.

I need to check and manipulate other headers for other reasons, so I'm
using the email module for that.  In order to keep things consistent
and easy to understand, I'd like to use the email module to prepend
the Received header as well.  That keeps my application from having to
have any knowledge about e-mail message formatting.

-- 
Grant Edwards               grant.b.edwards        Yow! ... I want a COLOR
                                  at               T.V. and a VIBRATING BED!!!
                              gmail.com