I agree with imvain2 -> the invisible field is a really simple and great way to check if it's a SPAMBOT or human without impacting on your customer.
All you need to do is write code which says :
Code:
<?php
if(!empty($_POST["myemail"]){
$spam = true;
} else {
$spam = false;
}
?>
Then just before you send off the email message you check whether it's true or false and if it's true, don't send the email :
Code:
if(!$spam){
// send your email
}
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