Email encoding (DKIM, long lines, etc..)

Hi !

I am implementing DKIM validation for my emails.

I noticed than some emails do not pass DKIM validation due to different body hashes.

I followed the email flow, and found that postfix automatically truncates lines to 998 characters if they are too long (in accordance to https://tools.ietf.org/html/rfc2822#section-2.1.1).

Such emails can be generated by Sentry, by my own apps, etc..

Now about Django:

When using EmailMessage, the charset is utf-8, and the Content-Transfer-Encoding is either 7bit or 8bit (automatically changes between them when the body contains non-ASCII characters).

cf the ticket where the developers decided to switch from base64 to this behaviour : https://code.djangoproject.com/ticket/3472

Quick validation with:

>>> from django.core.mail import EmailMessage
>>> print EmailMessage('subject', 'body', 'from.me@example.net', ['to.you@example.net']).message().as_string()
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Subject: subject
From: from.me@example.net
To: to.you@example.net
Date: Wed, 30 Apr 2014 11:01:44 -0000
Message-ID: <20140430110144.1564.85693@localhost>
body

So at the moment, because Django says not to use base64 for utf-8 emails in its code, Django does no longer make sure that the lines are not too long, despite the RFC.

I see 3 ways to make sure that the lines are not too long :

• automatically split lines in a way that can be recognized by email readers (no idea how to do that properly..) (in Django/in the apps)
• go back to base64 (but it seems to increase spam scores)
  
• switch to quoted-printable (functioning code below, no idea of the potentially negative impact)

from django.core.mail.message import utf8_charset  from email import Charset  utf8_charset.body_encoding = Charset.QP

What do you think ?

Is Django code / app code the correct place to fix this ?

Should Django respect the RFC ?

Any other ideas ?

Thanks !

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