def get_template(self, type_):

        """

        Locate and return the Mako email template of the given type

        (e.g. 'html'), or ``None`` if no such template can be found.

        """

        try:

            return self.templates.get_template('{0}.{1}.mako'.format(self.key, type_))

        except TopLevelLookupException:

            if self.fallback_key:

                try:

                    return self.templates.get_template('{0}.{1}.mako'.format(self.fallback_key, type_))

                except TopLevelLookupException:

                    pass

    def normalize_attachments(self, attachments):

        normalized = []

        for attachment in attachments:

            if isinstance(attachment, six.string_types):

                attachment = self.normalize_attachment(attachment)

            normalized.append(attachment)

        return normalized

    ATTACHMENT_MIME_MAP = {

        '.pdf': 'pdf',

        '.xls': 'vnd.ms-excel',

    }

    def normalize_attachment(self, path):

        root, ext = os.path.splitext(path)

        ext = ext.lower()

        if ext == '.csv':

            with open(path, 'rb') as f:

                part = MIMEText(f.read(), 'csv', 'utf_8')

            filename = os.path.basename(path)

            part.add_header('Content-Disposition', 'attachment; filename="{}"'.format(filename))

            return part

        else:

            mimetype = self.ATTACHMENT_MIME_MAP.get(ext)

            if mimetype:

                with open(path, 'rb') as f:

                    part = MIMEApplication(f.read(), mimetype)

                filename = os.path.basename(path)

                part.add_header('Content-Disposition', 'attachment; filename="{}"'.format(filename))

                return part

        raise ValueError("Magic is not (yet) supported, please construct your own attachments for file: {}".format(path))

    def make_message(self, data={}, attachments=[], inlines=[],