Anti-Spammer Master

Developed by


Anti-Spammer Master for concrete5 is a robust all-in-one spam prevention tool to stop spam dead in its tracks.

No third-party tracking, no privacy-rights breach, no private data saved, no monthly fee, just full-on anti-spam protection.

What can it do?

  • Block spam words and expressions in multiple languages found in public denylists
  • Block spam words and expressions found in concrete5 denylist
  • Block disposable emails
  • Block invalid emails
  • Block URL shortening services
  • Limit the number of links allowed in messages
  • Block Forms submitted too fast by bots (check the tutorial)
  • Honeypot integration (check the tutorial)
  • Block bots hosted on Amazon AWS servers
  • Block bots using anonymous TOR IPs
  • Block multiple submission in a short time
  • Filter for HTML content
  • Filter for BB code
  • Block known exploit attempts
  • Check minimum length and number of words of messages
  • Block IPs found in public denylists
  • Block IPs blacklisted by concrete5
  • Check for specific HTTP headers
  • Block User Agents found in public denylists
  • Block Referrers found in public denylists

Here's a screenshot showing you the kind of results I got on my own website

Spam statistics from

Where will spam blocking work?

Anti-Spammer Master will work with:

  • The core Express Form block
  • The core Legacy Form block
  • The core Conversations block
  • Private messages
  • Any third party form system implementing concrete5 Spam system

No anti-spam system is 100% foolproof. Anti-Spammer Master will do an excellent job blocking most automated spam and even some manual spam but your mileage will definitely vary.

Current Version: 1.0.2
Fully Translatable: Yes
Needs External Libraries: No
Compatible 8.3.1+
License: Standard
Support Response: Replies to tickets every business day.
Support Hosted: On
Needs extra server permissions: No
Needs Internet: No
Marketplace Tests:
Passed Automated Tests
Passed PRB Review