I have a client who is using Drupal and has an email contact form. The problem is they are getting spam sent through the form daily.
I have tried the Re-captcha plugin, captcha plugin, Anti-spam (Askimat), and Honeypot plugins.
The offenders are using programs like XRumer which is capable of solving captcha's and none of these plugins have been able to stop the bots.
So I am asking others if they have any advice on how to stop these contact form spam submissions?
Since this particular form shouldn't have a legitimate reason for a URL in the body section, possibly I could detect URL's and then return an error if they are present when a form is submitted?