def send_email(subject, body, send_to):

    try:

        msg = EmailMessage(subject, body, Config.MAIL_USERNAME, [send_to])
        msg.content_subtype = "html"
        msg.send()

        return True

    except:
        current_app.logger.info(
            'ERR - Cannot send email, please check MAIL settings')
        current_app.logger.info('    -> MAIL Subject: ' + subject)
        current_app.logger.info('    -> MAIL Body: ' + body)
        return False
def background_task(
    channel_url, text, subscribers, subject, mfrom, send_uid, attachments=[]
):
    logger.info(
        'Start send "{subject}" to {subscribers} recipients through channel "{channel}".'.format(  #  noqa
            subject=subject, subscribers=len(subscribers), channel=channel_url
        )
    )
    try:
        with app.mail.get_connection() as conn:
            for i, mto in enumerate(subscribers):
                msg = EmailMessage(
                    from_email=mfrom,
                    to=[mto],
                    body=text,
                    subject=subject,
                    connection=conn,
                )
                msg.content_subtype = "html"
                for attachment in attachments:
                    msg.attach(
                        filename=attachment.get("filename", ""),
                        content=attachment.get("data", ""),
                        mimetype=attachment.get("content_type", ""),
                    )
                try:
                    msg.send()
                except SMTPRecipientsRefused:
                    logger.info("[SKIP] - {}: invalid address.".format(mto))
                if (i + 1) % 1000 == 0:
                    logger.info(
                        "- Sending status: {}/{}".format(i + 1, len(subscribers))
                    )
    except Exception as e:
        logger.error("Message not sent:")
        logger.exception(e)
        send_complete(channel_url=channel_url, send_uid=send_uid, error=True)
        return
    send_complete(channel_url=channel_url, send_uid=send_uid)
    logger.info("Task complete.")