Spam Blocker

80% of all email is either spam, phishing or email fraud, causing each of your users to waste an average of 100 hours per year cleaning out their inbox. For even a single user, Spam Filter quickly pays for itself in reclaimed productivity, not to mention reduced frustration and actual financial losses. Arm yourself and fend off the criminals who are clogging your inboxes and wasting your time.

NG Firewall sits between the Internet and your mail server and filters and quarantines fraudulent email—spam, phishing and email fraud—preventing it from reaching your users. Its smart analysis delivers a catch rate of 99.5% while minimizing false positives. Spammers constantly adjust their content and tactics to evade spam blockers. Spam Blocker is updated in real-time to keep you one step ahead of spammers. Quarantine is automatic and maintenance-free.


  • Leverages Bayesian filter technology that is constantly learning and evolving to catch spammers as they tune and evolve their techniques.

  • IP address blocking blacklists are maintained in real-time, exploiting the wisdom of crowds to catch spammers at the earliest possible point.

  • Image, URL and character filtering leverages signature files to increase the efficacy of the email filter.

  • Multilingual capabilities ensure that it addresses the full spectrum of languages.

Get Spam Blocker

Cut down on junk mail, solicitations and spam. Reduce spam by over 99%. This app is included in NG Firewall Complete, our most comprehensive software package available.

Starting at $25.00 a month!

30-Day Free Trial

Not ready to buy? Try it in your network risk-free.

Block 99.5% of all spam.

Spam Blocker

Block 99.5% of all spam.

NG Firewall’s flexibility and ease-of-use works for our continuously growing network. David Matakas, KECdesign
Stuff just gets picked up and zapped. Jason Zeinstra, Orthopaedic Associates of Grand Rapids

Spam Blocker Lite App

Spam Blocker Lite leverages spam filtering techniques including Bayesian Filters, Razor, Real-time Blackhole List (RBL), OCR for image spam and tarpitting. Learn More.


  • Quarantine for each mailbox to enable users to manage their own spam folders.

  • Personal Passlists enable users to designate specific email addresses as “trusted”.

  • Image-based filtering scans images within emails to stop this spamming technique.

  • SMTP support.

  • Reports give a comprehensive view of the spam on your network, including the source of the spam, ham-to-spam ratios, trending and stats per user.

Spam Blocker Lite does not require a paid subscription. Install a free trial of NG Firewall to use every app in NG Firewall for 30 days. After your free trial, you will be able to continue to use this app without a paid subscription.