For the past while, I've put up a PHP form on my website that emails me whenever someone fills out the form. However, ever since I put up the form, I have received about 30 spam form entries everyday from the same few sources (as I see from their fake email addresses). Most of them go to my junk email, but someone uses the email address "firstname.lastname@example.org". The word "some" in the email is always changing, (ie. email@example.com). I wanted to block this email, but I didn't want to stop receiving email from dreamhost. Is there a script that I could use to stop this spam, yet is still easy to use for my other visitors?
Thanks for your time!