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Microsoft Defender for Office 365 vs Symantec Messaging Gateway comparison

Why PeerSpot?
 

Comparison Buyer's Guide

Executive Summary

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

Microsoft Defender for Offi...
Ranking in Secure Email Gateway (SEG)
2nd
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
61
Ranking in other categories
Email Archiving (1st), Email Security (2nd), Advanced Threat Protection (ATP) (3rd), Microsoft Security Suite (9th)
Symantec Messaging Gateway
Ranking in Secure Email Gateway (SEG)
12th
Average Rating
8.2
Reviews Sentiment
6.8
Number of Reviews
20
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of September 2026, in the Secure Email Gateway (SEG) category, the mindshare of Microsoft Defender for Office 365 is 13.9%, down from 27.5% compared to the previous year. The mindshare of Symantec Messaging Gateway is 3.0%, up from 2.5% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG) Mindshare Distribution
ProductMindshare (%)
Microsoft Defender for Office 36513.9%
Symantec Messaging Gateway3.0%
Other83.1%
Secure Email Gateway (SEG)
 

Q&A Highlights

CO
IT System Administrator at Rochester Public Utilities
Dec 09, 2022
 

Featured Reviews

Emeka Ndulu - PeerSpot reviewer
Cloud Solutions Architect at a tech services company with 201-500 employees
Improves threat visibility and response while reducing manual tasks and training users against phishing
I appreciate the attack simulation feature whereby I get to train users and educate them on how to identify phishing emails and spam emails, as well as the anti-spam protection. It gives me visibility into my threat environment and threat landscape to ensure that I am one step ahead of any likelihood of threats within my environment. I get to detect it and respond, so the threat intelligence is very effective. Microsoft security solutions save my time. It saves money because once I protect my environment, I don't lose money. It has decreased my detection time and my time to respond.
Dennis O'Reilly - PeerSpot reviewer
Cyber SecOps Principal at Dotcom Security
The product provides good content filtering options, but the false positive submissions must be improved
The tool is very stable. I rate the stability a seven out of ten. It's an on-premise application that runs on a virtual machine. It has dependencies on the hypervisor host that we're running it on. If it's not configured, the application can be influenced by it. Sometimes, there is a service stop error while the service is still running. Sometimes, the service just stops. Some policies do not act the way that we intend them to respond.

Quotes from Members

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

Pros

"At the moment we are satisfied with this product. It's a stable, scalable, and resilient solution for us."
"Defender enables us to secure all 365-related activity from a single place. It gives us visibility into everything happening in Outlook, protecting us against phishing and other email-based threats. Defender helps us detect any suspicious behaviors."
"My experience with customer support and technical support for Microsoft Defender for Office 365 has been excellent."
"The risk level notifications are most valuable. We get to know what kind of intrusion or attack is there, and we can fix a problem on time."
"The good part is that you don't have to configure it, which is very convenient."
"The DLP feature of Microsoft Defender for Office 365 is valuable, and we also use the DLP feature for email real-time detection."
"Microsoft Defender for Office 365 is a cloud-based email filtering service that helps protect our organization against unknown malware and viruses by providing robust zero-day protection and includes features to safeguard our organization from harmful links in real-time."
"The feature I like the most about Microsoft Defender for Office 365 is that it typically runs in the background—you do not know it is there until you need to access it."
"The main thing that I appreciate about this product is that the database of spam, malware, and ransomware is very large."
"The feature that I like the best is the fingerprinting concept."
"Since Symantec Messaging Gateway is a Linux-based solution it is stable."
"The solution is excellent at blocking spam."
"Symantec Messaging Gateway has a huge knowledge base about phishing, spamming, spoofing, etc."
"The solution is "set and forget". You pay for it and everything is done for you."
"We use the solution for its advanced virus protection, phishing and other features."
"The solution is a leader in anti-spam email products and you can block 99% of spam emails, making it very effective with great performance."
 

Cons

"We need a separate license and we don't know how to get the license that is required."
"Configuration requires going to a lot of places rather than just accessing one tab."
"The product must provide better malware detection."
"The visibility for the weaknesses in the system and unauthorized access can be improved."
"Microsoft should provide more documentation for users so they can self-educate. I would like to see more documentation for advanced security features."
"I think Microsoft Defender for Office 365 can be improved by creating more educational pieces about not just looking for malware."
"We are waiting for better software to block viruses."
"I assess the stability and reliability of the solution as seven out of ten."
"What needs to be improved in Symantec Messaging Gateway is its local partner support, as it's not as technical. The support my company gets from the partner isn't good. Vendor support is good, but local partner support isn't. I'm happy with Symantec Messaging Gateway as a solution, but the problem is with its partner support. To me, Symantec Messaging Gateway is a complete solution, but it can be very difficult to search the web for resolutions to issues or problems you experience from it. If this could be improved or resolved in the next release of Symantec Messaging Gateway, then that would be good."
"It is a nice product but is not user friendly in terms of the graphical interface. It is poor and is not rich in terms of the human interface."
"What needs to be improved in Symantec Messaging Gateway is its local partner support, as it's not as technical."
"The solution interface is from 2003 and is outdated. Symantec Messaging Gateway needs to update the interface."
"This product would benefit from better integration with Symantec Endpoint Protection."
"The solution takes up a lot of memory."
"Messaging Gateway's advanced malware detection could be improved."
"It will provide Excel reports and PDF reports, but it would be great if they supported the concept of Crystal Reports."
 

Pricing and Cost Advice

"I was working in the government and it was too expensive for us to use our Microsoft products."
"For large enterprise organizations, they can definitely afford it, but for small and medium organizations, they might struggle to cover the expenses."
"The license is expensive because the cost is based on the number of users."
"The product is very expensive."
"It is much more expensive than using another solution because we have had to include some options and upgrade our license."
"While Microsoft Defender for Office 365 necessitates pricier E3 or E5 subscriptions, the extensive functionality offered by these licenses across various Microsoft products justifies the investment."
"Microsoft Defender for Office 365 is an add-on to the Office license. Many customers are purchasing this solution."
"Defender for 365 comes in various plans and licenses, along with other Microsoft security solutions. Purchasing this kind of package or security bundle gives good value for money, and that's what I recommend."
"A subscription for technical support costs extra."
"The cost of Symantec Messaging Gateway is too expensive in general. However, the appliance also includes the price of the license in the same bundle."
"Symantec Messaging Gateway’s pricing is very cheap."
"For 150 users, we pay INR 1,60,000."
"It's a bit expensive compared to its competitor Barracuda Email Security Gateway but cheaper than Sophos Email."
"They're a little costly compared to Microsoft."
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Top Industries

By visitors reading reviews
Computer Software Company
11%
Manufacturing Company
9%
Financial Services Firm
8%
Comms Service Provider
8%
Outsourcing Company
19%
Construction Company
15%
Financial Services Firm
13%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business24
Midsize Enterprise11
Large Enterprise32
By reviewers
Company SizeCount
Small Business11
Midsize Enterprise1
Large Enterprise9
 

Questions from the Community

What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
My experience with pricing, setup, and licensing is that it's actually quite reasonable even on the licensing side as a standalone product. It's very competitive compared to what competitors are ch...
What needs improvement with Microsoft Defender for Office 365?
I think Microsoft Defender for Office 365 can be improved by creating more educational pieces about not just looking for malware. We are seeing a lot more malware-less emails that Defender for Offi...
What is your primary use case for Microsoft Defender for Office 365?
My main use cases for Microsoft Defender for Office 365 include email hygiene.
Ask a question
Earn 20 points
 

Also Known As

MS Defender for Office 365
Symantec.cloud, Symantec Email Security.cloud
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
Doric, Joblink Plus, Our Lady of Mercy College, Parramatta, PPB Advisory, Slater & Gordon Lawyers, Sydney Adventist Hospital Ltd.
Find out what your peers are saying about Microsoft Defender for Office 365 vs. Symantec Messaging Gateway and other solutions. Updated: August 2026.
914,262 professionals have used our research since 2012.