Form submitting watermark/placeholder text

Hello,

I’m using placeholder text in a couple of form fields but when the user doesn’t fill them in the form submits the placeholder text, meaning they an email with “Your website if you have one” in for example. Is there a way round this?

Example form code:

<label for="W_senderWebsite">Your website</label>
[text W_senderWebsite /50 id:W_senderWebsite class:W_senderWebsite placeholder "If you have one"]

Thanks for any help

https://wordpress.org/plugins/contact-form-7/