massmailer.py

def async_mass_mailing(subject, message, from_mail, recipients_list, offset=0, limit=100):
    if not recipients_list:
        return
    for email in recipients_list[offset:offset + limit]:
        send_mail(subject, message, from_mail, [email])
    async_task(
        async_mass_mailing,
        subject=subject,
        message=message,
        from_mail=from_mail,
        recipients_list=recipients_list[100:],
        offset=offset + limit,
        limit=100
    )