On my website I used a combination of HTML and PHP to render pages. Every time I navigate through the site pages, I recieve tons of emails with blank contact form information. I don't know why I'm getting them because I never submitted a form (just navigating through pages).

Does anyone know why this is happening?

Another strange thing is that I can't find the email address string in any of the web pages. Yet, I still receive the emails addressed to me despite not finding that they exist in the pages.

I do have a contact page but it has validation on it so it should not send email with blank field values.

is the email coming from your site directly? How are you sending the emails in your form? send/mail? or smtp? if smtp put into effect if you can and if it hasn't already login to smtp before sending mail.

Do you receive emails when ever some visits your site or just you?

My guess is that php mail() function is being called automaticly some how.

There are in one of your pages a php script to send email ...
So it sends email every time page is loaded
This may be due that some day you where testing a php mail script, and maybe forget it in some page and didn't delete.
And of course blak because it does'n received fiels from any contact.

So what to do ?
check out what page is causing the sent emails... i mean naviguate in some pages, check email, until you find the page that send it, and just fix that...
Or, if all pages sends email, so I think your are using something like

 include ("sendmail.php");

or somethink like that, then make sure that not all pages include the script...

Ihope this will help you
Good luck !