Get Avatar Name

Hey, I was wondering how you could make a script that is always scanning for Avatars, and when one avatar comes within a certain amount of meters it sends an email to something?

default
{

	state_entry() 
        {
		llSensorRepeat("", NULL_KEY, AGENT, 5, PI, 5);
	}
	sensor(integer total_number) 
       {

		llEmai((address),llKey2Name(llDetectedKey(0));
	}

}

EDIT:

what next post downs says

The 2 second sleep has no effect. It will be 5 seconds between each sensor event in any case because of the period of your llSensorRepeat(). So the results will be that you get a sensor event, pause for 2 seconds (keeping any other events from firing during this time--not that you have any in this script anyway), then return from the event handler and wait 3 more seconds before another (potential) sensor event. I'd just take out the sleep. Make the period of llSensorRepeat() a little longer if you really want to decrease load.

Have no clue what a delay would be for, sending an email delays the script 20 seconds anyways, as far as not 'spamming' with multiple emails, why not keep a list, and clear it once an hour, something like so:

string avatar;
float range = 5.0;  // set range here
string address = "your_email_address@goes.here"; // replace with your email address
integer resetTime = 3600; // # of seconds between visited list being cleared, 3600 = once per hour
string subject = "Visitor Detected";
list visited;

sendEmail (string name)
{
    string message = name + " has been detected";
    llEmail (address, subject, message);
    return;
}

default
{
    state_entry()
    {
        llSetTimerEvent (resetTime);
        llSensorRepeat("", NULL_KEY, AGENT, range, TWO_PI, 5);
    }
    
    timer ()
    {
        visited = [];
    }
        
    sensor (integer detected)
    {
        avatar = llDetectedName (0);
        integer check = llListFindList (visited, [avatar]);
        if (check == -1)
        {
            sendEmail(avatar);
            visited += avatar;
        }
    }
}