How to prevent spam on a form
140528
How to Prevent SPAM without CAPTCHAs or a Centrally managed system (e.g. akismet)
38272
What Constitutes Spam?
119731
Postfix check outgoing mail for spam
103807
Disable submit button on form submit
78328
A potentially dangerous Request.Form value was detected from the client
32207
Way to list "Contact Us" email address on web site, yet reduce likelihood of spam?
48472
What's the best way to highlight a Required field on a web form before submission?
85575
How to prevent user registration
154478
Post a Form to Popup window not to the parent
92730
Use a normal link to submit a form
128353
How to flag comments as spam?
5057
How do I spamtrap with Postfix?
76014
How does Stack Overflow handle spam?
111841
How to prevent form from being submitted?
104071
Defend against flag spam in chat
131673
How do websites block selecting text and how do I unblock that?
255
How can I prevent SQL injection in PHP?