Dkim

pydkim

Python module that implements DKIM (DomainKeys Identified Mail) email signing and verification. It also provides helper scripts for command line signing and verification.

Snippet

from django.core.mail.backends.smtp import EmailBackend
from django.conf import settings
import dkim # http://hewgill.com/pydkim

class DKIMBackend(EmailBackend):
    def _send(self, email_message):
        """A helper method that does the actual sending + DKIM signing."""
        if not email_message.recipients():
            return False
        try:
            message_string = email_message.message().as_string()
            signature = dkim.sign(message_string,
                                  settings.DKIM_SELECTOR,
                                  settings.DKIM_DOMAIN,
                                  settings.DKIM_PRIVATE_KEY)
            self.connection.sendmail(email_message.from_email,
                    email_message.recipients(),
                    signature+message_string)
        except:
            if not self.fail_silently:
                raise
            return False
        return True