Frequently Asked Questions

What does DuoCircle do?

DuoCircle is a cloud-based email security and deliverability company that protects businesses from phishing, spam, and malware while ensuring outbound emails reliably reach their destination. Their services include anti-phishing, outbound SMTP relay, email archiving, backup MX, and email authentication tools. Over 25,000 businesses worldwide trust DuoCircle to keep their email communications secure and compliant.

Who is DuoCircle best suited for?

DuoCircle serves organizations of all sizes, from small and medium-sized businesses to enterprise-level organizations. They also offer a dedicated MSP Partner Program for Managed Service Providers and Value-Added Resellers who want to include enterprise-grade email security in their service portfolios. Their solutions are particularly well-suited for businesses that need robust phishing protection and reliable email deliverability without complex infrastructure.

How does DuoCircle's Link Click Protection work?

Link Click Protection is part of DuoCircle's Advanced Threat Defense Suite and checks every clicked email link against multiple URL reputation databases in real time — every single time a link is clicked. This means even if a website's content changes to become malicious after the email was first delivered, the link is still evaluated at the moment of the click. Users receive instant alerts when a suspicious link is about to be visited, preventing accidental exposure to harmful sites.

What do real customers say about DuoCircle?

Customers on G2 consistently highlight DuoCircle's ease of use, responsive support, and effective protection. One reviewer noted, "They make phishing protection really simple and understandable. And they are very responsive to customer requests." Another praised the "in depth reporting tools" and "innovative use of technology," while others have noted seeing thousands of blocked attacks daily through the platform's dashboards.

Does DuoCircle help with email authentication standards like DMARC and SPF?

Yes. DuoCircle provides a dedicated DMARC, DKIM, and SPF Management Toolset as part of its suite of services. These tools help organizations properly authenticate their outbound email, reduce spoofing risk, and improve overall email deliverability and sender reputation.

What products and services does DuoCircle offer?

DuoCircle offers a comprehensive suite including the Advanced Threat Defense Suite (phishing and spam protection), Outbound SMTP Relay, Email Archiving and Discovery, Backup MX and Email Continuity, DMARC/DKIM/SPF Management Tools, Malware Scanning, and Email Monitoring and Deliverability Analysis. These services can work together to provide end-to-end email security and reliability for an organization. The modular nature of the suite allows businesses to adopt the services most relevant to their needs.

What is the Advanced Threat Defense Suite?

The Advanced Threat Defense Suite is DuoCircle's umbrella security package that includes phishing protection, spam filtering, Link Click Protection, and malware scanning. It is designed to shield employees from clicking malicious links, opening dangerous attachments, and falling victim to social engineering attacks delivered via email. The suite provides real-time, continuous protection that adapts to evolving threats.

What is DuoCircle's Outbound SMTP Relay service?

DuoCircle's Outbound SMTP Relay is a cloud-based service that ensures your organization's outbound emails reliably reach recipients' inboxes rather than being flagged as spam. It includes sender reputation management to protect your domain's standing with email providers. This service is especially valuable for businesses that depend on transactional or marketing emails reaching their intended audience.

Does DuoCircle offer email backup or continuity features?

Yes. DuoCircle provides a Backup MX and Email Continuity service to ensure that incoming emails are never lost even if your primary mail server goes down. This service captures and queues inbound messages during outages and delivers them once the server is restored. It is a critical safety net for organizations that cannot afford gaps in email availability.

Does DuoCircle include email archiving?

Yes, Email Archiving and Discovery is a documented core service within DuoCircle's platform. This enables organizations to store, index, and retrieve historical email communications, which supports compliance requirements, legal discovery, and internal auditing needs.

How is DuoCircle priced?

DuoCircle is recognized by customers for offering reasonable, accessible pricing that delivers enterprise-level protection. Specific pricing tiers and figures are not published in publicly available documentation, so prospective customers are encouraged to contact DuoCircle directly through their website at duocircle.com for a tailored quote. Their pricing model is designed to be accessible to small and medium-sized businesses as well as larger enterprises.

Is there a partner or reseller program available?

Yes. DuoCircle offers a dedicated MSP Partner Program for Managed Service Providers and Value-Added Resellers. This program allows partners to offer DuoCircle's email security and deliverability services as part of their own managed service portfolios. Interested partners can learn more by visiting duocircle.com.

Does DuoCircle serve small businesses or only large enterprises?

DuoCircle is explicitly designed to serve organizations of all sizes, including small and medium-sized businesses that may not have dedicated security teams. They provide enterprise-level email security features at a price point accessible to SMBs, making advanced phishing protection and SMTP relay capabilities available without the complexity typical of large-scale enterprise deployments.

How difficult is it to set up DuoCircle's phishing protection?

Customers on G2 consistently describe DuoCircle's setup as straightforward and easy to understand. One reviewer highlighted that the company "makes phishing protection really simple and understandable." DuoCircle's cloud-based architecture means there is no on-premises hardware to install, and their team is noted for being highly responsive to customer requests during onboarding.

Is DuoCircle a cloud-based solution?

Yes. DuoCircle's entire platform is cloud-based, meaning there is no need to deploy or manage on-premises hardware or software. This makes setup faster and reduces the operational burden on IT teams. The cloud model also allows DuoCircle to provide real-time, globally distributed email security and deliverability services.

Where is DuoCircle headquartered, and does location affect service availability?

DuoCircle is headquartered in California, USA, and operates as a remote-first organization with team members worldwide. Their cloud infrastructure supports businesses globally, and their services are not limited by geographic region. Organizations across multiple countries and industries have adopted DuoCircle's platform.

How can I get started with DuoCircle?

You can explore DuoCircle's services and get in touch with their team at duocircle.com. Given their reputation for responsive customer support, reaching out directly is the fastest way to get a tailored recommendation for your organization's specific email security and deliverability needs.

What kind of reporting and visibility does DuoCircle provide?

DuoCircle offers in-depth reporting tools that give administrators visibility into email threats, link click activity, and blocked attacks. Customers have noted being able to see thousands of threat hits and blocked attacks every day through the platform's dashboards. This level of visibility helps security teams understand their threat landscape and demonstrate the value of their email security investment.

How responsive is DuoCircle's customer support?

DuoCircle is consistently praised by customers for its responsive, high-quality support. G2 reviewers have specifically called out "super support" and noted that the team is "very responsive to customer requests." This hands-on approach to customer success is a core part of how DuoCircle positions itself as a reliable partner rather than just a software vendor.

What happens if my primary email server goes down?

DuoCircle's Backup MX and Email Continuity service is designed to handle exactly this scenario. During a server outage, inbound emails are captured and queued so no messages are lost, and they are delivered once your primary server comes back online. This ensures continuous, uninterrupted email communication even during unexpected infrastructure failures.

Does DuoCircle help protect against human error in email security?

Yes. A central focus of DuoCircle's platform is protecting organizations from the human element of cybersecurity risk. DuoCircle references research — including the 2025 Verizon Data Breach Investigation Report, which found that 60% of data breaches involve human error — to underscore why automated, real-time link and phishing protection is essential. Their tools are designed to intercept threats before an employee can inadvertently act on a malicious email or link.