If you have then you would have received an instant reply by email.
It was an autoresponder which handled the process automatically.
An autoresponder is a software program that sends emails to website visitors who have requested the information.
It can follow up that first email with a series of further emails where you can choose how many days elapses between each message.
And it can send a mass email (also known as a broadcast) to all contacts on its list.
NEXT ==> Why you need an autoresponder