Adding Carbon Copy

There are lots of post on this but none of them give an example of how one might go about it so I'm hoping to create a post here that others can use to solve this issue until it becomes a core feature.

I'm trying to allow the sender to send themselves a copy of the message. Right now I have it so on post submission if the checkbox is checked I'm getting the email field but I need to know the best way to duplicate the notifications.

Here is what I have:

add_action("gform_post_submission_1", "my_submit_form", 10, 2);

function my_submit_form($entry){
//if checkbox value is set to true then display the email address
if($entry["4.1"] =="true"){
die ($entry["2"]);
}
}

This is just a simple test to get the email address. Now my question is, can I use a built in form feature to send a copy of the message or should i use wp_mail or mailto() instead? An example would be awesome

Thanks that did the trick

For anyone who wants to do this here is a snippit:

add_action("gform_pre_submission_filter", "my_submit_form", 10, 2);

function my_submit_form($form){
       //check if checkbox value is set to the correct value
	if($_POST['input_id'] =="value"){  //id and value of the checkbox here

       //Send Email to the OP
    	$bcc  = $_POST["input_id"]; // id of the email field here

    //setting notification BCC field to the list of fields
    $form["notification"]["bcc"] = $bcc; 

     return $form;  //return

	}
//box not checked return
   else{ return $form;  }
}