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DuoCircle LLC

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564 reviews
  • 9 profiles
  • 9 categories
Average star rating
4.8
#1 in 1 categories
Grid® leader
Serving customers since
2014
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DMARC Report

473 reviews

Built specifically for MSPs and large domain portfolio reporting, DMARC Report is a powerful reporting tool for measuring the quality of outgoing emails and watching out for sneaky cyberattacks. You can safeguard your outgoing emails from threats like domain forgery, email spoofing, and other phishing attacks. DMARC Report gives businesses an inside look at how their customers receive or react to their messages. It also allows them to identify whether malicious activity like domain forging may be taking place on other networks outside of theirs; it's just good cybersecurity practice!

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Phish Protection by DuoCircle

46 reviews

A cloud-based, integrated, email protection suite that stops phishing, malware, spam and spoofing without installing any expensive anti-phishing tools.

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AutoSPF

21 reviews

Overcome the 10 Lookup Limit on SPF records with AutoSPF. SPF flattening and management powered by Cloudflare.

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OutboundSMTP

13 reviews

A High Performance Outbound SMTP Service

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Mailflow Monitoring

4 reviews

Mailflow Monitoring alerts you, in real-time, to down email servers and helps diagnose excessive delivery delays. Things that can negatively impact your business if not corrected quickly. And it's FREE.

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Tenant Migration

3 reviews

Tenant Migration is an enterprise-grade email queuing service designed to ensure zero email loss during Office 365 or Google Workspace tenant migrations. By capturing and securely storing incoming emails for up to 45 days, it guarantees uninterrupted communication throughout the migration process. Key Features and Functionality: - Unlimited Mailboxes and Storage: Accommodates any number of mailboxes without storage limitations, ensuring scalability for organizations of all sizes. - High-Capacity Servers: Utilizes robust servers capable of handling large volumes of emails efficiently. - Automatic Failover: Automatically queues emails whenever the primary mail server is unavailable, preventing any loss of communication. - Message Replay: Offers an exclusive feature that allows for the redelivery of messages, providing a safety net in case of initial delivery failures. - Real-Time Control Panel: Provides an intuitive interface to monitor queued messages and manage their delivery with ease. - 24/7 Technical Support: Ensures round-the-clock assistance through live chat, phone, and email to address any issues promptly. Primary Value and User Solutions: Tenant Migration addresses the critical challenge of email loss during tenant migrations by offering a reliable and secure email queuing solution. It mitigates business risks associated with email downtime, ensuring that no messages are lost even when the primary mail server is down. This service is particularly valuable for organizations undergoing mergers, acquisitions, or any scenario requiring tenant migration, providing peace of mind with its SOC 2 certified platform and straightforward setup process.

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DuoCircle Spam Filtering

2 reviews

The DuoCircle enterprise email security with its SMTP gateway incorporates the features that you’d expect in an Enterprise Grade Spam Filtering solution at a fraction of the cost.

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Mail Hosting Services

1 review

Secure, easy to use email IMAP/Webmail accounts for business.

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Spamsentinel

1 review

SpamSentinel is an advanced email security solution designed to protect your HCL Domino environment from spam, phishing, and other email threats. Reliable & Secure – It provides real-time spam filtering, malware scanning, and anti-phishing protection to keep your organization’s email safe and efficient. Seamlessly integrating with HCL Domino, SpamSentinel is easy to deploy and highly effective at reducing unwanted email clutter.

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DuoCircle LLC Reviews

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Peter T.
PT
Peter T.
07/28/2026
Validated Reviewer
Verified Current User
Review source: Organic

DMARC Report tracks mails sent via multiple domain names

DMARC Report is a solid and affordable tool for aggregating XML-reports that receiving mail servers send back to sending mail servers. Thanks to DMARC Report, I'm able to obtain insightful details about the email domains of my clients before I have to ask questions. As an expert in email deliverability this helps me to understand in what ways the companies I work for (try to) mail their audiences. AI is available for reporting, by the way. Of course, this also enables me to find out if a domain is abused, which can be solved with a stricter policy and eventual messaging to warn about phishing attempts. As a bonus, DMARC Report offers a hosted service for managing DMARC policies. No need to modify policies manually. This works smoothly. Furthermore, there is a widget that allows me to integrate an iframe in a dashboard on the client site. This is available in a secure and a reliable way.
Raul F.
RF
Raul F.
Economista
07/21/2026
Validated Reviewer
Verified Current User
Review source: Organic
Incentivized Review

From DMARC data to actionable email improvements

DMARC Report has evolved from a reporting tool into a more complete email authentication and monitoring platform. It still does its core job very well: turning complex aggregate and forensic reports into a clear view of authorized senders, SPF and DKIM alignment, pass rates, and suspicious activity. I particularly value the continuous monitoring and alerts, as well as the added visibility provided by TLS-RPT and hosted MTA-STS. The newer AI-assisted analysis and REST API are also useful additions for teams that want faster explanations, automated alerts, or custom reporting. Most importantly, the platform remains approachable despite its growing feature set. It helps us protect our domain, improve deliverability, and understand what is happening without having to interpret raw XML reports.
Luis P.
LP
Luis P.
Senior SEO Specialist en SIDN Digital Thinking
07/18/2026
Validated Reviewer
Verified Current User
Review source: Organic
Incentivized Review

A must-have for email authentication

I was unaware until recently of the PDF summary reports that DMARC generates, which can be accessed from their regular report emails. These PDF reports are great both for myself and for clients with whom I'm using this. It provides great insight into email compliance, which can be used to improve email deliverability.

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HQ Location:
San Diego, CA

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@duocirclellc

What is DuoCircle LLC?

Reliable and Secure email hosting services for SMB and Enterprise. Safely processing over 100 million emails per month for our customers. Enhanced gateway security and filtering, inbound email security, email service backup and outbound SMTP using a new high quality infrastructure for top quality results that our customers deserve. Products include, Secure email gateway, email backup MX, email forwarding, outbound SMTP and more...

Details

Year Founded
2014