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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 (42nd)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
6.1
Number of Reviews
32
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 1.0%, up 0.5% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 12.6% mindshare, down 15.4% since last year.
Email Security Market Share Distribution
ProductMarket Share (%)
Fortra's Clearswift Secure Email Gateway1.0%
Microsoft Defender for Office 36511.5%
Proofpoint Email Protection8.2%
Other79.3%
Email Security
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security12.6%
Microsoft Defender for Office 36527.5%
Proofpoint Email Protection21.0%
Other38.9%
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.
ShaheenKapery - PeerSpot reviewer
Provides valuable security features and has a straightforward setup process
The initial setup process is straightforward and takes a weekend at most. A .com domain can take up to forty-eight hours, while a local domain takes about four to eight hours because it has to propagate through the international DNS records. It is a cloud-only solution. If you're managing email security on-premises, you use your bandwidth to download emails, including spam, and then use your servers to clean it up. For example, say a third of your email is spam; this consumes significant bandwidth and resources. However, if you use Mimecast, they filter the emails on their servers before delivering them to you. It can be a major selling point in regions with expensive bandwidth, such as Africa. You can save bandwidth and improve overall efficiency by offloading the spam filtering to Mimecast.

Quotes from Members

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

Pros

"A stable solution."
"Ability to create your own content-filtering policies with relative ease."
"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."
"Mimecast certainly helped my customers reduce phishing emails."
"We like the content filtering and secure messaging features."
"In terms of efficacy, Proofpoint is better than Mimecast, though it's a little difficult to manage."
"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 reviewer gave Mimecast Email Security a rating of 10 out of 10."
"I would rate Mimecast Email Security a nine out of ten."
"I recommend Mimecast based on customer requirements and budget."
 

Cons

"FTP server and TRUST Manager functionality."
"Malware needs improvement."
"Mimecast need to ensure that the body text format is correctly handled and that images are properly embedded in the body text."
"The solution is very expensive."
"I did have a problem with Mimecast. That is why I was looking for an alternative solution because their sender IP address gets poorly rated by Microsoft."
"The reaction time between a new threat being identified and Mimecast picking it up needs to be narrowed a bit."
"As a user, the user interface of the management console could be upgraded, for example."
"The platform's cost-effectiveness could be improved."
"The solution should include more AI features instead of Mimecast's more general static configuration tooling."
"Its pricing can be improved. It is a bit expensive."
 

Pricing and Cost Advice

Information not available
"The product price is moderate. I rate the pricing a five out of ten."
"Compared to the other solutions in the market, Mimecast Email Security with Targeted Threat Protection's pricing is fine."
"It's an expensive solution."
"The licensing costs are per-user for the product that you get with them."
"I'm always going to say the price needs to be lower, but it's reasonable."
"On a scale of one to ten, where one is cheap, and ten is expensive, I rate the pricing a ten."
"The product has good pricing in terms of return on investment."
"The customers can select the license packages as per their requirements."
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Top Industries

By visitors reading reviews
Computer Software Company
16%
Government
12%
Financial Services Firm
11%
Comms Service Provider
8%
Computer Software Company
14%
Financial Services Firm
7%
Manufacturing Company
7%
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?
If I ask you about the room for improvement, we discussed the phishing aspect, the DNS system, and the key rotation. Apart from that, are there any other areas that you would like to see improved o...
 

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 Security, Proofpoint and others in Email Security. Updated: August 2025.
867,497 professionals have used our research since 2012.