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Spam Filtering 3 min read

Effective Spam Filtering Protects Your Employees

Brad Slavin
Brad Slavin General Manager
Updated May 27, 2025

Quick Answer

Effective spam filtering removes inbound junk before it reaches inboxes, which matters because over 90% of security breaches start with email and roughly 91% of corporate attacks begin with spam or other email-borne threats. DuoCircle's cloud-based Spam Filtering Gateway removes 99% of inbound spam with a false positive rate around 0.0001%, blocks viruses and malware, supports DKIM and DMARC validation, and lets users tune their own permitted and blocked sender lists. Paired with the Advanced Threat Defense suite, it adds protection against domain spoofing, malicious attachments, and zero-day attacks, plus a Smart Adaptive Quarantine that pushes the sorting burden back to senders, real-time activity logs, a 30-day MX backup queue, and 24/7 chat, email, and phone support.

Spam

Spam is more than just an annoyance, and effective spam filtering is a critical part of any IT security plan. Each day, corporate email servers are inundated with a vast amount of spam. To combat this rising tide, organizations need sophisticated spam filtering. When proper spam filtering is in place, employee inboxes are kept free of unwanted messages, and unwanted traffic stays off the network.

But spam represents more than the threat of unwanted traffic. Over 90% of security breaches begin with some form of email attack, and spam, by definition, is email. The first line of defense against email borne threats therefore consists of superior spam filtering. DuoCircle’s Spam Filtering Gateway is a cloud-based solution that eliminates spam before it can reach your network.

DuoCircle’s Spam Filtering Gateway

As a part of the Advanced Threat Defense Suite from DuoCircle, the Spam Filtering Gateway provides organizations with a superior cloud-based spam filtering solution.With best in class data centers located world-wide, you can take advantage of cloud based email or use your own email server in conjunction with our commercial grade spam filtering engine.

DuoCircle’s Spam Filtering Gateway solution provides:

  • The removal of 99% of all spam from your inbound email along with a 0.0001% false positive rating.
  • A reduction of unwanted mail through user-configurable message content filtering.
  • The security of 100% protection against viruses and malware with 100% uptime.
  • Employee ability to set policies to filter permitted and blocked senders.
  • Support for email validation, including DKIM and DMARC.

protection

In order to provide the superior level of protection DuoCircle does, sophisticated and multi-layered detection engines are used, alongside intelligence that identifies and mitigates against the risks posed by spam. Other known and emerging threats are identified and eliminated before they can propagate within your network.

Advanced Threat Defense: Protection Form Spam is Only The Beginning

Spam and email-based threats are the source of 91% of successful corporate attacks. In light of this uncomfortable fact, it makes sense to combine your spam filtering solution with threat detection systems to defend against email-borne attacks. But Advanced Threat Defense protects your organization from more than just spam.

DuoCircle Advanced Threat Defense pulls together all the tools your organization needs in a single integrated solution to protect and defend your employees from spam, malware, ransomware, phishing, and malicious attachments.

Using an intelligent classification engine, we detect these threats in real-time and defend against them with the highest possible level of accuracy.

Threats are stopped in their tracks before they can wreak havoc on your network. Advanced Threat Defense from DuoCircle provides:

  • Protection from malware and zero-day attacks, with 100% availability.
  • Spam protection that eliminates 99% of all incoming spam with a false positive rate of less than one in ten thousand.
  • Unlimited users and unlimited inbound message volume.
  • Protection against domain name spoofing.
  • Blocking of malicious attachments.
  • Real-time activity logs, with access to the email queue and click reporting.
  • Smart Adaptive Quarantine, which puts the burden of sorting spam messages on the sender rather than the recipient.
  • A thirty-day backup queue – 30 days of MX backup service included.
  • Chat, email and phone support is available 24/7
Brad Slavin
Brad Slavin

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

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