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

[Grant Edwards]

On 2014-05-07, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On May 7, 2014 9:13 AM, "Chris Angelico" <rosuav at gmail.com> wrote:
>>
>> On Thu, May 8, 2014 at 1:06 AM, Burak Arslan <burak.arslan at arskom.com.tr>
> wrote:
>> > Seeing how discussion is still going on about this, I'd like to state
>> > once more what I said above in other words: You just need to do this:
>> >
>> > "Received: blah\r\n" + message.to_string()
>> >
>> > or better:
>> >
>> > socket.write("Received: blah\r\n")
>> > socket.write(message.to_string())
>> >
>> > And again, this is not a hack, this is how it's supposed to work.
>>
>> Yes, that method does work... if you're taking it in and sending it
>> right out again. But it means you have to hang onto two pieces of data
>> - the message and the new Received header - until you write it to a
>> file/socket.
>
> Alternatively, you could use a BytesIO to prepend the Received header to
> the raw data *before* you parse it with the email module.

That's probably what I ought to do. But subclassing Message and adding
a prepend_header was just too easy, and it avoids having to have my
app know anything about the format of an email message in general or a
header in particular.  For example, I don't know what characters (if
any) need to be escaped or specially encoded in the contents of a
header.  I also don't remember off the top of my head what you're
supposed to do with headers that get too long (I think you just stick
in a \r\n followed by some whitespace and then continue the header,
but I'd have to look that up and then test it).

I did know how to insert a tuple of two strings at the beginning of a
list.  :)

-- 
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