You can set up a triggered campaign to send once a contact has been subscribed to a list.
To do this, follow these steps:
Hover over ‘Subscribers’ from the main navigation bar and select 'Lists' from the dropdown.
Click on the list that you wish to use.
Select the ‘List Information’ tab.
From here, you can select the trigger campaign that you want to send when a subscriber joins the list.
Please note: The trigger campaign must exist before you can select it here.
You can also select an email address to send a subscription and an unsubscription confirmation to.
When you're done, click 'Save' at the bottom of the page.