sign up based or closed group autoresponder with ZCRM?

sign up based or closed group autoresponder with ZCRM?

I am capturing leads from another source and entering them into my ZCRM-leads.  I want to send these leads, as they are entered on different dates, a sequence of emails offset by date.  I realize I can set up the import of the leads from ZCRM to Campaign, segment and select the list.  Which autoresponder option do I use to accomplish?