Submit a batch of email addresses for cleaning. Provide either a CSV file upload (multipart/form-data) or a JSON body with an emails array (max 500). Cleaning runs asynchronously; the response returns a job_uuid to poll with Get Cleaning Status or to download once complete. By default the account owner is emailed when the job finishes; supply notify_email to send elsewhere, or an HTTPS callback_url to receive a webhook instead of an email.