Form validation - auto subscribing to list serves by spammers

[Tanya32]

Sorry if this is the wrong forum. Anyone out there have any code that would prevent a spammer from auto subscribing to a list serve, i.e., hidden fields or? anything that works, these are valid emails and are mainly coming from gmail.com

[Philip]

Try using a Security Image.

[DeathStar]

How do i get an validation image?

[Tanya32]

We don't want to use an image.  We are looking for some code that will bounce the subscription if they fill out the "unseen" field.

[alpine]

Are you saying that you want an empty hidden field in your form and check if the hidden field contains data when submitted ?

if(empty($_POST['the_hidden_field']))
{
// the field is empty
}

[Tanya32]

Yes, so it won't submit the form when the hidden field is filled out.