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DuoCircle LLC

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557 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

466 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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1
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1
Markus K.
MK
Markus K.
03/11/2026
Validated Reviewer
Review source: Organic

DMARC Report – A powerful and easy-to-use tool

DMARC Report is structured and clearly laid out. Setting up new domains is quick and easy. The overview is excellent, allowing you to see all relevant information at a glance. The report provides us with a quick overview of DMARC compliant and non-compliant DMARC messages. The support team responds very quickly and efficiently to questions.
Peter J.
PJ
Peter J.
03/10/2026
Validated Reviewer
Review source: G2 invite
Incentivized Review

AutoSPF Flattens SPF Records Seamlessly & Keeps Changes Logged - I am quite pleased with the product

It does what it promises to do, and does it very well. I appreciate that it keeps a log of changes made, which prevents many mistakes. A client's SPF record would have way too many lookups, but AutoSPF makes that problem go away. The length of the SPF record is typically not the issue; it's the amount of lookups in the record that are. AutoSPF "flattens" the record, automatically expanding the defined lookups to IP addresses or ranges. And it auto-updates the record when the un-flattened lookups change. BTW I discovered AutoSPF in a web search several years ago. I do not recall any other product that I evaluated, but the price seemed right (still is), and I haven't looked back.
John C.
JC
John C.
Technical Director (CTO) @ Doublesided | Digital experiences for health + wellbeing organisations | We help HealthTech brands educate people about their health conditions and empower them to live longer, healthier lives
03/10/2026
Validated Reviewer
Verified Current User
Review source: Organic

Essential for digital agencies hosting websites for clients

Even for a technical person, there are many things to check each month as part of our support service. When I'm looking at Non compliant (unknown senders), I am so happy that they added "Analyze with AI". This new feature (since my last review) saves me having to copy the information into Perplexity and chat there. I can click the analyze with AI in DMARC Reports and find out what actions I need to take to block people pretending to be one of our clients and tricking people. For example, a few years ago a supplier made a bank transfer to pay an invoice seemingly raised by a client. But it was all a scam! The email didn't come from finance. The supplier's bank was able to reverse the funds, but this was damaging for the client. Setting up email protection correctly and then monitoring emails is exactly why we choose to use this service and provide value for our clients.

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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