This depends on the delivery schedule you select. If you select "Immediate Delivery," you receive a separate email for each item that matches your alert criteria. You might receive a large amount of mail using this option.

If you select "Daily Delivery," up to 20 of the most recent items matching your alert criteria are sent in each email.

Please note: With Daily Delivery, if more than 20 items match, only the latest 20 are sent to you.