My contact form goes to spam folder

Question

I want little help. My contact form works fine , but why are my emails going into recipients' spam folders? Thank you in advance!

Here is my code:

opswork

I guess its something wrong here, because the information about sender is too little

<?php

$to = 'my_email@myhost.bg';


$date=date("l, F jS, Y");
$time=date("h:i A");

$subject=$_REQUEST['contact-subject'];
$type=$_REQUEST['type'];
$name=$_REQUEST['contact-name']; 
$email=$_REQUEST['contact-email']; 
$message=$_REQUEST['contact-messege'];