Preventing spam submissions that pass validation
We've added Alphanumeric and Restrict Content validation to 5 standard fields in a contact form yet our clients are regularly bombarded with the following type of thing....
Is there a way to add validation that requires there to be at least two words, which would help the Name and Enquiry fields?
Is there a way to insist that the telephone number field starts with either a "+" or a "0"?
There's nothing we can do about the e-mail field. The details are false, but it's a legitimate e-mail format.
We don't want to go down the route of adding a CAPTCHA, or similar, just for a regular contact form. Is there anything else we could consider?