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Fortra's Clearswift Secure Email Gateway vs Mimecast Email Security comparison

 

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

Fortra's Clearswift Secure ...
Average Rating
8.6
Reviews Sentiment
7.1
Number of Reviews
0
Ranking in other categories
Email Security (41st)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
6.1
Number of Reviews
31
Ranking in other categories
Office 365 Protection (3rd), Secure Email Gateway (SEG) (4th)
 

Mindshare comparison

While both are Messaging and Collaboration solutions, they serve different purposes. Fortra's Clearswift Secure Email Gateway is designed for Email Security and holds a mindshare of 1.1%, up 0.7% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 12.8% mindshare, down 14.1% since last year.
Email Security Market Share Distribution
ProductMarket Share (%)
Fortra's Clearswift Secure Email Gateway1.1%
Microsoft Defender for Office 36510.9%
Proofpoint Email Protection7.8%
Other80.2%
Email Security
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security12.8%
Microsoft Defender for Office 36527.5%
Proofpoint Email Protection20.6%
Other39.1%
Secure Email Gateway (SEG)
 

Featured Reviews

PC
Stable, but malware needs improvement and customer support is poor
They need to improve the malware in the product. I am not satisfied with Clearswift because of the lack of customer support. The support is poor, the supplier takes a lot of time and it's expensive. We have some issues here when I contact the supplier, it takes a lot of time for them to get back to us but there's no solution. I am now looking at Symantec as a possible alternative.
Frank Rawson - PeerSpot reviewer
It gives clients peace of mind and helps them educate their users about threats
A few years ago, our team found the implementation to be somewhat challenging. It has gotten easier as we've grown more experienced. The difficulty depends on the expertise of the person doing it. I don't work with Mimecast every day, so it might be more difficult for me than it is for one of my techs who regularly does Mimecast implementations. It requires some specific in-depth product knowledge and an understanding of email solutions. The deployment time varies. In South Africa, it depends on who you use to deploy it. If you use one of Mimecast's local partners, it can take up to two weeks because of their process. However, it's only about four to eight hours of work. After deployment, there isn't much maintenance aside from supporting and educating your customers. Users require constant education on how to use the Mimecast client and release an email that has been blocked.

Quotes from Members

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

Pros

"Ability to create your own content-filtering policies with relative ease."
"A stable solution."
"The most valuable feature is the DMARC Analyzer."
"I recommend Mimecast based on customer requirements and budget."
"It's really quite user-friendly. In terms of technical superiority and the product itself, there are no complaints. It is really cutting edge."
"The interface of this solution is very easy to navigate and user-friendly. There is no delivery in email and other communications, making it reliable. The configuration is relatively easy."
"In terms of efficacy, Proofpoint is better than Mimecast, though it's a little difficult to manage."
"In the current environment that the world is in, everyone is trying to hack everyone else, so Project+ definitely helps a lot there."
"The initial setup is easy."
"Mimecast certainly helped my customers reduce phishing emails."
 

Cons

"Malware needs improvement."
"FTP server and TRUST Manager functionality."
"The product's interface could be improved to be more user-friendly."
"From an administrative point of view, Mimecast is a little bit cumbersome and difficult. It's not something that the end-user can easily find navigate themselves."
"The solution is complex and not easy to use."
"The feature that should be included is to remove the block on the encrypted files."
"As a user, the user interface of the management console could be upgraded, for example."
"Many of our users complain that the system is blocking too many attachments. It's a good practice from a security perspective, but our users think Mimecast is doing too much. It might be something we'll have to adjust."
"The tool can be challenging because it relies on rule-based configurations, especially for addressing impersonation threats. This approach requires setting up numerous rules to ensure filtering. It should work based on behavior-based analytics."
"The price could be better, it should be reduced."
 

Pricing and Cost Advice

Information not available
"Compared to the other solutions in the market, Mimecast Email Security with Targeted Threat Protection's pricing is fine."
"The licensing costs are per-user for the product that you get with them."
"The product has good pricing in terms of return on investment."
"We pay monthly fees to our provider."
"It's an expensive solution."
"The solution is expensive."
"It is a bit expensive."
"I'm always going to say the price needs to be lower, but it's reasonable."
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Top Industries

By visitors reading reviews
Computer Software Company
14%
Financial Services Firm
10%
Government
10%
Comms Service Provider
10%
Computer Software Company
15%
Financial Services Firm
7%
Manufacturing Company
6%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business16
Midsize Enterprise7
Large Enterprise11
 

Questions from the Community

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What do you like most about Mimecast Email Security with Targeted Threat Protection?
The interface of this solution is very easy to navigate and user-friendly. There is no delivery in email and other communications, making it reliable. The configuration is relatively easy.
What needs improvement with Mimecast Email Security with Targeted Threat Protection?
Mimecast Email Security can be improved by adding some API integrations. Instead of remaining a traditional gateway, Mimecast Email Security needs to provide API solutions similar to Check Point.
 

Also Known As

No data available
Mimecast Email Security with Targeted Threat Protection
 

Overview

 

Sample Customers

Information Not Available
Azizi Developments, Affinity Credit Union, Aftercare, Al Abbar Group
Find out what your peers are saying about Microsoft, Abnormal AI, Proofpoint and others in Email Security. Updated: November 2025.
873,085 professionals have used our research since 2012.