a. By default, when an email campaign is active, it will send emails to all buyers. However, you can use the Filters to narrow down whom you want to send emails to, based on their orders, items, or channels.
b. By default, the feedback request emails will be sent 5 days after an order is shipped. You can adjust this value to have the emails sent out on an earlier or later date based on your channel. However, we recommend that you set this value to 5-10 days to ensure the buyer has received the item and had a chance to use it.