How to secure POSTs made by limiting where they are sent from
97626
How to cheat and avoid cheating in Flash games?
123625
Prevent Multiple Form Submissions (Server side)
82668
How To ? Form Post to Multiple Locations
53083
Exclude post ID from wp_query
130635
Postfix - How to prevent external clients from using my server as a relay?
111841
How to prevent form from being submitted?
1832
Prevent mail being marked as spam
96280
How to enforce sender address to be "logged-in-user@example.org" in Postfix?
154433
How do I protect random people pointing their domain to my server?
131179
How to allow new users to post without moderation in phpBB 3?
137470
How to restrict anonymous users to a single product and quantity 1 using Commerce and Rules?
16325
Should spam posts be edited?
103159
How do I protect sending scores from HTML5 games to my server
70385
Prevent the OP commenting on their own post?
66665
How to prevent an email from accidentally being forwarded?
24029
Ways to circumvent the same-origin policy
92012
Obfuscate spam in page title as well