Sending an autoresponder email to contact already on the mailing list

Sending an autoresponder email to contact already on the mailing list

I have been collecting contacts with a signup form and have about 20 contacts registered there. I recently set up an autoresponder for this list (to send two days after the registration). Once I turn on the autoresponder, will my response email be sent to existing members of the list? If not is there a way to push these emails via a command?