Hello,
I apologize for the confusion. While technically it would be possible to create something in our API that sent an email to an email address when they signed up to the account, based on the list that they signed up to. Our system is not really designed to do this. In the methods that are set up to do automatic emails, the welcome email and autoresponders, they can only be set up per account. So that you can have one autoresponder going out to a set of lists, but you cannot have a second autoresponder on a different set. The welcome email also can only go out to people who are signed up "by contact", and does not differ between lists.
The only work around would be to create a complex system where as a contact signs up, it is assigned to an additional, but empty list, and then an email is created and scheduled for that list. Once the contact gets the email, he would be removed from the list and it would have to be repeated. While this is possible, it is not really a great way to do it, and again, our system is not really designed to be used in that way.
If you have any questions please let me know.
Regards,
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