In order to get an auto-response to your email address when someone signs up on your join my mailing list you would need to have it custom coded using an API. Other than the use of our API you would also have to program the functionality of the email response on your server as at this time it is not something we offer as a service. However we can update you daily on the amount of contacts that sign up from with in your account.
You can find the information you need to do this inside of your account.
Also if you need help with anything inside of your account that does not deal with our API you can call into our support line at 866.289.2101.