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Barracuda Email Security Gateway vs Microsoft Defender for Office 365 comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Apr 20, 2025

Review summaries and opinions

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

Categories and Ranking

Barracuda Email Security Ga...
Ranking in Secure Email Gateway (SEG)
5th
Average Rating
8.0
Reviews Sentiment
7.6
Number of Reviews
52
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
7.1
Number of Reviews
52
Ranking in other categories
Email Archiving (1st), Email Security (1st), Advanced Threat Protection (ATP) (1st), Microsoft Security Suite (11th)
 

Mindshare comparison

As of May 2025, in the Secure Email Gateway (SEG) category, the mindshare of Barracuda Email Security Gateway is 6.4%, down from 8.5% compared to the previous year. The mindshare of Microsoft Defender for Office 365 is 29.5%, down from 39.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG)
 

Featured Reviews

Mohammed Shah Newaj - PeerSpot reviewer
Instantly blocked and reduced our spam emails
The solution has to improve in a very specific way. When we allow our customers to send or scan email through our Barracuda Email Security Gateway, we are permitting their email server IP address, but not any domain. One of our customers has an email server where they are hosting five domains within their server. They are sending and receiving email through that server by using Barracuda Email Security Gateway. Therefore, we allow their IP address to send email through our Barracuda Email Security Gateway, then we declare MX for receiving email on behalf of our customers. After receiving the email, we deliver it to the specific IP address of the customer. Since we are only allowing the IP address, if an incident happens within a customer's email server or an email server gets compromised, then it starts sending spam. That creates a huge problem for the solution as it allows all emails because the customer's IP address is allowed to relay email through our Barracuda Email Security Gateway. Barracuda should add an option where it can add multiple domains, such as abc.com, bbc.com, and cbc.com. Therefore, this domains' emails will be allowed and other domains' emails will not be relayed through Barracuda Email Security Gateway. Whereas, if you allow the IP address, then any of the domain's emails will be relayed through Barracuda Email Security Gateway. That is the drawback that I have observed. So, Barracuda should work on this.
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.

Quotes from Members

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

Pros

"There are plenty of features, such as sandboxing capabilities with zero threat protection. It has all the leading email security appliances compared to other solutions."
"It can scale."
"I like Barracuda's cloud sandbox feature."
"The feature that sets Barracuda apart from other solutions is the Office 365 cloud-to-cloud backup."
"Eliminating inbox clutter creates an opportunity to be more productive instead of wasting time manually sorting through spam."
"The client has the option to blacklist or whitelist any email address or domain based on the sender and recipient filters. If they want, they can restrict any IP addresses so email won't be received from those IP addresses."
"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 heterogeneous environment."
"It catches a lot of things and has the ability to add domains as well as add senders and update their things."
"The most valuable feature is protection against malicious links, fishing, and impersonation. You can train people to be aware of these threats, but they're not always careful. When they're using their phones between meetings, they click on a link, and it's game over."
"My experience with customer support and technical support for Microsoft Defender for Office 365 has been excellent."
"Scalability-wise, I do not think there are any issues so far."
"Since we have started using the solution, there have been fewer compromises."
"The basic features are okay and I'm satisfied with the Defender."
"It also gives me good visibility because, with Defender, I'm using a Microsoft product to defend Microsoft products. The integration was really seamless and I have wide visibility because it picks up almost everything. Literally, I can see almost every activity that happens, from the e-mail to the workstation itself."
"The most valuable feature of Microsoft Defender for Office 365 is data backups that we can provide through ticket requests."
"Microsoft Defender for Office 365 is a stable solution."
 

Cons

"The solution should add automatic alerts to the mobile."
"The solution could improve by adding DomainKeys (DKIM) functionality. This is something that is essentially required nowadays for outbound security. They do not have it on their on-premise solution appliance but they have alternate arrangements for their cloud solution."
"There is room for improvement in the management of multiple domains."
"Barracuda Email Security Gateway can improve email detection. We have some emails that are bypassing the threat scanning. There are some impersonation emails passing through."
"I would like to have better integration with third-party archival vendors to facilitate moving data in and out."
"The UI could be a little cleaner and require less clicking around in different modules. They give the illusion of a single pane of glass, but as you click around to different products, you're actually being transferred into a different system."
"Barracuda Email Security Gateway can improve reporting and anti-spam. The anti-spam engine is not working well. We are seeing a lot of problems where spam is going through the gateway. Additionally, access privilege should be given to the IT support, because they don't have a lot of privileges. We are forced to give our IT support administrative access in order to clear and deliver emails and this should not be happening."
"Solution requires regular checking to ensure it's 'keeping up' with spam."
"Specifically, within Microsoft Defender for Office 365, I want it to improve the DLP capabilities."
"You should be able to deploy Defender for every subscription without the need to add servers."
"Microsoft needs to broaden its global support presence by establishing teams of subject-matter experts in all regions."
"They can improve their security in a way where a customer can know if all their attachments are safe or not to open through a report. The solution does its job perfectly, but it never reports to the customer whether those attachments have been stopped before or not."
"Microsoft security solutions work as expected. They are constantly updating the solutions to make them better. At the same time, the changes can impact a customer's environment, and we need to adjust settings. Sometimes we aren't aware of the changes, and nothing is pushed from the backend automatically."
"Too many false positives and lacks an accurate capability to detect malicious SharePoint sites."
"Configuring the default strategies and policies in Microsoft Defender for Cloud Apps generates a lot of noise and false positives."
"The visibility into threats is not up to the mark, as I do not have control. I rate my experience with Microsoft Defender for Office 365 as six out of ten due to troubleshooting and pricing concerns."
 

Pricing and Cost Advice

"Compared to other products, this solution is quite affordable."
"We typically purchase a one or three-year license for Barracuda Email Security Gateway."
"It is a cost-effective and relatively cheap solution as compared to others. Our customers have a yearly subscription. We do have a few customers with monthly subscriptions, but they have cloud-based Email protection, which is a different type of solution. Both solutions are very good."
"e solution's pricing is exceedingly high, and it continues to increase."
"The solution is priced low. We have received a good price discount here in Sri Lanka. There are additional licenses we have to purchase a license for the ATP."
"We find the solution's pricing okay."
"The regular pricing was initially very reasonable, but three years ago, Barracuda revised their price list and SKUs, resulting in a significant doubling of the standard prices."
"This is one of the major points for integrating this solution in any organization. Barracuda Email Security Gateway needs to make it a bit more tolerable for customers because it is increasing every year. They should create a plan for reducing the cost."
"It's a user-base subscription."
"The license is expensive because the cost is based on the number of users."
"I know that the product is incredibly expensive."
"I was working in the government and it was too expensive for us to use our Microsoft products."
"Compared to other brands, Microsoft Defender for Office 365's pricing is competitive."
"Microsoft Defender is expensive. I typically recommend it only if clients have the budget. Otherwise, I would suggest an alternative."
"Microsoft Defender for Office 365 is an add-on to the Office license. Many customers are purchasing this solution."
"Defender is a little bit more expensive as compared to others. We are in the manufacturing environment. So, we don't have a high budget for all of our endpoint devices. Its cost is a major concern for us."
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Top Industries

By visitors reading reviews
Educational Organization
50%
Computer Software Company
8%
Financial Services Firm
5%
Manufacturing Company
4%
Computer Software Company
16%
Financial Services Firm
8%
Manufacturing Company
8%
Government
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Barracuda Email Security Gateway?
Barracuda Email Security Gateway is very simple to use.
What needs improvement with Barracuda Email Security Gateway?
Barracuda Email Security Gateway should include ATP in the next release.
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?
Money-wise, it is a part of the Office 365 ( /products/office-365-reviews ) suite, making it slightly more expensive compared to Trend Micro. Although Defender is free, you have to pay separately f...
What needs improvement with Microsoft Defender for Office 365?
The main area for improvement is simplifying the implementation and rollout process. There are many conditions to be met, making it challenging to ensure every system is protected. Troubleshooting ...
 

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: April 2025.
850,671 professionals have used our research since 2012.