...
from django.conf import settings
from monitoring.instrumentation import Instrumentation
from sendgrid import Attachment as SendGridAttachment
from sendgrid import Category, Mail, SendGridAPIClient
...

class SendgridMailClient(MailClient):
    def __init__(self) -> None:
        self._templates: dict = settings.EMAIL_TEMPLATES
        self._instrumentation = SendgridMailClientInstrumentation(Instrumentation())
        self._client = SendGridAPIClient(settings.SENDGRID_API_KEY)

    def send_new(self, email_info: MailInfo) -> None:
        email_settings = settings.EMAIL_TEMPLATES[email_info.template_name]

        email_message = Mail(
            from_email=email_settings["from_email"],
            to_emails=email_info.to_email,
        )

        email_message.template_id = email_settings["template_id"][email_info.language_code]

        email_message.category = [Category("transactional"), Category(email_info.template_name)]

        self._add_context(email_info=email_info, email_message=email_message)

        self._add_attachments(email_message=email_message, attachments=email_info.attachments)

        try:
            self._client.send(email_message)
            Instrumentation().logger.info(
                "[SendgridMailClient] Email sent",
                language_code=email_info.language_code,
                template_name=email_info.template_name,
                context=json.dumps(email_info.context),
            )
        except Exception as exception:
            self._instrumentation.email_send_error_new(exception, email_info)
            raise exception

    def _add_attachments(self, email_message: Mail, attachments: list[Attachment]) -> None:
        for attachment in attachments:
            sendgrid_attachment: SendGridAttachment = self._map_sendgrid_attachment(attachment)

            email_message.add_attachment(sendgrid_attachment)

    def _add_context(self, email_info: MailInfo, email_message: Mail) -> None:
        context: dict[str, Any] = email_info.context

        email_message.dynamic_template_data = context

    def _map_sendgrid_attachment(self, attachment: Attachment) -> SendGridAttachment:
        encoded_file_content = base64.b64encode(attachment.content).decode()

        return SendGridAttachment(
            file_content=encoded_file_content,
            file_type=attachment.mimetype,
            file_name=attachment.name,
        )