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

[Chris Angelico]

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".

ChrisA

[1] http://www.ietf.org/rfc/rfc2821.txt