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Symantec Messaging Gateway vs Tessian Guardian comparison

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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

Symantec Messaging Gateway
Average Rating
8.2
Reviews Sentiment
6.8
Number of Reviews
20
Ranking in other categories
Secure Email Gateway (SEG) (12th)
Tessian Guardian
Average Rating
0.0
Number of Reviews
0
Ranking in other categories
Email Security (61st), Data Loss Prevention (DLP) (60th)
 

Mindshare comparison

While both are Messaging and Collaboration solutions, they serve different purposes. Symantec Messaging Gateway is designed for Secure Email Gateway (SEG) and holds a mindshare of 3.0%, up 2.5% compared to last year.
Tessian Guardian, on the other hand, focuses on Data Loss Prevention (DLP), holds 0.6% mindshare, up 0.2% since last year.
Secure Email Gateway (SEG) Mindshare Distribution
ProductMindshare (%)
Symantec Messaging Gateway3.0%
Proofpoint Email Protection18.0%
Mimecast Advanced Email Security14.1%
Other64.9%
Secure Email Gateway (SEG)
Data Loss Prevention (DLP) Mindshare Distribution
ProductMindshare (%)
Tessian Guardian0.6%
Microsoft Purview Data Loss Prevention5.7%
Forcepoint Data Loss Prevention4.4%
Other89.3%
Data Loss Prevention (DLP)
 

Featured Reviews

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.
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Top Industries

By visitors reading reviews
Outsourcing Company
19%
Construction Company
15%
Financial Services Firm
13%
Comms Service Provider
6%
Construction Company
20%
Comms Service Provider
14%
Healthcare Company
12%
Financial Services Firm
10%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business11
Midsize Enterprise1
Large Enterprise9
No data available
 

Also Known As

Symantec.cloud, Symantec Email Security.cloud
No data available
 

Overview

 

Sample Customers

Doric, Joblink Plus, Our Lady of Mercy College, Parramatta, PPB Advisory, Slater & Gordon Lawyers, Sydney Adventist Hospital Ltd.
Affirm, Choate, BMA, Evercore, Gubra, Accel, Fieldfisher, Clearwater, Man Group plc, Graphcore, Investec, Rightmove
Find out what your peers are saying about Proofpoint, Microsoft, Mimecast and others in Secure Email Gateway (SEG). Updated: August 2026.
913,924 professionals have used our research since 2012.