Product Avatar Image

DuoCircle LLC

Show rating breakdown
565 reviews
  • 9 profiles
  • 9 categories
Average star rating
4.8
#1 in 1 categories
Grid® leader
Serving customers since
2014
Profile Filters

All Products & Services

Product Avatar Image
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!

Product Avatar Image
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.

Product Avatar Image
AutoSPF

21 reviews

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

Product Avatar Image
OutboundSMTP

13 reviews

A High Performance Outbound SMTP Service

Product Avatar Image
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.

Product Avatar Image
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.

Product Avatar Image
Spamsentinel

2 reviews

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.

Product Avatar Image
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.

Product Avatar Image
Mail Hosting Services

1 review

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

Profile Name

Star Rating

505
58
1
0
1

DuoCircle LLC Reviews

Review Filters
Profile Name
Star Rating
505
58
1
0
1
Jennifer S.
JS
Jennifer S.
Certified small business technology & marketing expert - Google, Microsoft, Intuit
08/04/2026
Validated Reviewer
Review source: G2 invite

Effortless Spam Management with Exceptional Support

I love that Spamsentinel, once installed, is easy to maintain and it rarely has false positives. It just does the job it says it does. It clears up the junk, allowing me to get to my real mail and put items where I can review them later without having to create rules for each mailbox manually. The support is outstanding, really fast and knowledgeable. I appreciate not having to have an admin go into quarantine to find client mail as Spamsentinel allows us to verify the mail and make sure real communications come through, not items from compromised client email addresses. The setup was easy, with installation on the server and entering the license keys, and their documentation is very thorough.
Doug R.
DR
Doug R.
07/31/2026
Validated Reviewer
Verified Current User
Review source: Organic

Easy Multi-Domain Management with Great Cloudflare Connectivity

Easy to use with our multiple domain environment. great connectivity to cloudflare
Verified User in E-Learning
UE
Verified User in E-Learning
07/30/2026
Validated Reviewer
Verified Current User
Review source: Organic

Effective DMARC reporting tool for monitoring Domain Email related suspicious activities

I can easily monitor Compliant, Non-compliant and DKIM aligned status of my domain

About

Contact

HQ Location:
San Diego, CA

Social

@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