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Barracuda Email Security Gateway vs Microsoft Defender for Office 365 comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jul 27, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
1.0
Barracuda Email Security Gateway prioritizes email safety, providing fewer disruptions despite potential ROI concerns for businesses and service providers.
Sentiment score
7.3
Microsoft Defender for Office 365 is praised for enhancing security, reducing costs, and improving productivity with integrated threat protection.
It has also decreased our time to detection and response by about 15 to 20 percent.
Overall, cost of owning and operating our system goes down.
It's hard to quantify the return on investment we've seen from Microsoft Defender for Office 365.
 

Customer Service

Sentiment score
8.5
Barracuda Email Security Gateway customer support is praised for responsiveness and efficiency, though limited by time zones and language.
Sentiment score
6.0
Microsoft Defender for Office 365 support is mixed, praised for responsiveness but criticized for delays and outdated documentation.
From the vendor, I would give the technical support an eight out of ten.
Over the past two years, there have been no critical problems.
we opened tickets, and they typically resolve them quickly.
Customer service and support have been fantastic.
 

Scalability Issues

Sentiment score
8.1
Barracuda Email Security Gateway is scalable for SMBs but may not suit very large enterprises, with varied user opinions.
Sentiment score
8.0
Microsoft Defender for Office 365 seamlessly scales for global users, enabling effective cybersecurity with adaptable cloud-based capabilities and careful planning.
We have never faced scalability problems, and Microsoft manages it effectively.
Microsoft Defender for Office 365 scales transparently for us, as we grew from 1,000 users to 3,000 users, and we didn't notice much difference.
 

Stability Issues

Sentiment score
8.2
Barracuda Email Security Gateway is reliable and stable, with quick resolutions for minor issues and high user ratings.
Sentiment score
7.5
Microsoft Defender for Office 365 is praised for its stability, reliability, operational effectiveness, and high user satisfaction despite minor issues.
The solution is stable, as we have been using it for the past two years.
I would assess the stability and reliability of Microsoft Defender for Office 365 as very stable, with barely any issues.
Overall, the stability and reliability of Microsoft Defender for Office 365 are good.
 

Room For Improvement

Barracuda Email Security Gateway needs upgrades in usability, integration, scalability, support, spam filtering accuracy, and anti-phishing measures.
Microsoft Defender for Office 365 needs better virus blocking, integration, threat detection, user-friendly configuration, and competitive pricing improvements.
When we add mails to email secure Sender Policy Authentication with extended options, all mails must pass this Mail Security Gateway.
Sometimes there are false positive emails coming through, so they should improve further on detection technologies and techniques.
If it's considered a phishing email, it should be blocked for all users, not just some.
The main area for improvement is simplifying the implementation and rollout process.
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published.
There is a different console for different things; I just want one consolidated console.
 

Setup Cost

The Barracuda Email Security Gateway is competitively priced, scalable, with varied user opinions and crucial regional market considerations.
Microsoft Defender for Office 365 offers comprehensive security, valued for integration with E3/E5 licenses, despite varied perceptions on cost.
Compared with others, Barracuda Email Security Gateway is cheaper.
We've likely saved 30% of costs.
Money-wise, it is a part of the Office 365 suite, making it slightly more expensive compared to Trend Micro.
Microsoft is quite affordable with a lot of features available for any size organization.
 

Valuable Features

Barracuda Email Security Gateway offers robust spam filtering, advanced threat protection, and user-friendly features for comprehensive email security management.
Microsoft Defender for Office 365 provides comprehensive security features, enhancing protection and efficiency across platforms with real-time threat detection.
The real-time threat intelligence feature is particularly useful as it detects all kinds of threats identified by incoming mails.
The most valuable feature of Barracuda Email Security Gateway that I have found is advanced threat protection.
It ranks the threats and allows us to prioritize those hitting us the hardest, such as email threats.
It provides end-to-end visibility on email threats such as phishing, extending beyond Exchange Online Protection.
The value of the DLP feature is significant to us because we have internal data, sometimes sensitive, and the users may not always be aware of security and privacy, which might lead them to send out information mistakenly to external parties.
 

Categories and Ranking

Barracuda Email Security Ga...
Ranking in Secure Email Gateway (SEG)
5th
Average Rating
8.0
Reviews Sentiment
6.7
Number of Reviews
55
Ranking in other categories
DMARC Authentication Software (4th)
Microsoft Defender for Offi...
Ranking in Secure Email Gateway (SEG)
1st
Average Rating
8.4
Reviews Sentiment
6.9
Number of Reviews
53
Ranking in other categories
Email Archiving (1st), Email Security (1st), Advanced Threat Protection (ATP) (2nd), Microsoft Security Suite (10th)
 

Mindshare comparison

As of August 2025, in the Secure Email Gateway (SEG) category, the mindshare of Barracuda Email Security Gateway is 6.2%, down from 8.6% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 28.1%, down from 36.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG)
 

Featured Reviews

WalidChowdhury - PeerSpot reviewer
Robust email protection with advanced features such as effective spam filtering, virus and malware defense, phishing protection and high scalability
Our customer faced a significant challenge with spam, leading to increased expenses. The complexity of their email infrastructure added to the issue, with some clients using Microsoft Exchange, others relying on different systems, and some operating on Linux platforms. To address this, we…
Tolu Omolaja - PeerSpot reviewer
Great URL scanning and attachment scanning, but I would like more proactive threat analysis
The two main features that prove most beneficial for us are URL scanning and attachment scanning. URL scanning involves an automatic scan of links and emails. When a user clicks on a link within an email, the system promptly checks the link's safety. If the link is deemed safe, access is granted automatically. However, if it is flagged as unsafe, we receive feedback and notification to caution us about the potentially harmful link. At this point, we are presented with the option to proceed or return. I have personally witnessed the system identify a few unsafe links, making this the primary advantage of using the solution. The second crucial aspect is the scanning of attachments. When an email containing an attachment arrives, we receive a notification of the new email, along with information that the attachment is being scanned for threats. This additional layer of security provides peace of mind for our organization. While Microsoft Defender for Office 365 offers numerous features, these two stand out as particularly impressive and valuable to us.
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Top Industries

By visitors reading reviews
Computer Software Company
14%
Manufacturing Company
9%
Financial Services Firm
9%
Government
6%
Computer Software Company
16%
Financial Services Firm
8%
Manufacturing Company
8%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Barracuda Sentinel?
It not only tackles spam effectively but also incorporates advanced features like ATP and active features which ensures a comprehensive and adaptable email security solution tailored to their hete...
What is your experience regarding pricing and costs for Barracuda Sentinel?
I would suggest that pricing for Barracuda Email Security Gateway rates around seven. It is not too expensive, but it is a considerable cost. Compared with others, Barracuda Email Security Gateway ...
What needs improvement with Barracuda Sentinel?
The Sender Policy Authentication needs improvement. When we add some customers related to our work, all mails should be delivered, not blocked. When we add mails to email secure Sender Policy Authe...
What do you like most about Microsoft Defender for Office 365?
Threat Explorer is an invaluable tool for me, and it plays a crucial role in helping me discern the origins of various email campaigns, pinpointing where they emanate from, and identifying the indi...
What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
Microsoft is quite affordable with a lot of features available for any size organization.
What needs improvement with Microsoft Defender for Office 365?
Microsoft could improve by offering recommendations for domain spoofing attacks, especially scenarios where DNS records like SPF, DKIM, and DMARC are not properly published. It's essential to enhan...
 

Also Known As

Barracuda Spam and Virus Firewall, Barracuda Sentinel
MS Defender for Office 365
 

Overview

 

Sample Customers

Evolution Recruitment Solutions, Evans Delivery Company, Osoyoos Credit Union, Synovis Life Technologies, Camden County Technical Schools, DEK, Evans Delivery Company, Colgate Rochester Crozer, Hemmera, South Carolina Heart Center, Ferma Corporation, Major League Baseball (MLB), Healy Brothers Automotive Group
Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Find out what your peers are saying about Barracuda Email Security Gateway vs. Microsoft Defender for Office 365 and other solutions. Updated: July 2025.
865,164 professionals have used our research since 2012.