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

Fortra's Clearswift Secure ...
Ranking in Email Security
31st
Average Rating
8.6
Reviews Sentiment
7.1
Number of Reviews
0
Ranking in other categories
No ranking in other categories
Mimecast Advanced Email Sec...
Ranking in Email Security
5th
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
47
Ranking in other categories
Email Archiving (2nd), Office 365 Protection (2nd), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of September 2026, in the Email Security category, the mindshare of Fortra's Clearswift Secure Email Gateway is 1.2%, up from 0.9% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 3.8%, down from 5.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security3.8%
Fortra's Clearswift Secure Email Gateway1.2%
Other95.0%
Email Security
 

Featured Reviews

PC
Systems Administrator at a financial services firm with 1,001-5,000 employees
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.
Avinash Mishra - PeerSpot reviewer
Manager - EUC at Finthrive
Advanced email filtering has blocked massive spam volumes and prevents unauthorized data leaks
Improvements for Mimecast Advanced Email Security include enhancing the user interface and accessibility, particularly regarding admin capabilities to add or modify user accounts. Streamlining this could improve overall usability and security management for users. Reporting is another area needing improvement in Mimecast Advanced Email Security, as the reports provided are not very easy to decipher. With artificial intelligence being integrated into various tools including Mimecast Advanced Email Security, I believe there is potential to enhance functionality, enabling users to ask specific questions and retrieve concise answers instead of overwhelming data. I choose a nine for Mimecast Advanced Email Security because improvements such as better user interface and artificial intelligence integration features would greatly enhance its usability. While no tool is perfect, these adjustments could greatly elevate Mimecast Advanced Email Security's capabilities.

Quotes from Members

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

Pros

"We use a few features for web proxy, and another feature is the email content filter and malware for our internal policy in the email content."
"Go for it! I think it's an excellent product with great technical support."
"Ability to create your own content-filtering policies with relative ease."
"A stable solution."
"Mimecast Mailbox Continuity helps companies continue to move."
"Mimecast certainly helped my customers reduce phishing emails."
"Based on overall experience, Mimecast Email Security is the best solution for traditional gateways."
"If I had to mention one or two things that bring the biggest benefit, I would say the security of the emails and dealing with everything."
"Overall, I consider Mimecast Advanced Email Security to be a reliable and effective security solution, with the highest value for organizations that face significant phishing and email-based threats and are willing to invest time in proper configuration and monitoring."
"In terms of efficacy, Proofpoint is better than Mimecast, though it's a little difficult to manage."
"The setup was easy."
"Mimecast Advanced Email Security proves to be a useful tool, allowing me as security personnel to work in a more peaceful manner."
 

Cons

"Malware needs improvement."
"FTP server and TRUST Manager functionality."
"I am not satisfied with Clearswift because of the lack of customer support."
"The reaction time between a new threat being identified and Mimecast picking it up needs to be narrowed a bit."
"The differentiation between bulk spam mail and campaign-related mail could be improved."
"The solution is complex and not easy to use."
"The interface and the documentation could be improved."
"External security features need improvement."
"Mimecast Advanced Email Security needs to improve in this area because they are only focusing on a particular set of problems which is on email and human risk, whereas companies that need a slightly bigger picture will look elsewhere."
"Their support should be improved. They are notorious for sending you to knowledge-based articles rather than actually talking to you, but that is, unfortunately, kind of becoming a trend with everything. In terms of features, I haven't had any complaints. However, I don't like the fact they moved to a paid training subscription model. They used to have a lot of free webinars for training, but they have started to charge for them in the past year."
"The solution should include more AI features instead of Mimecast's more general static configuration tooling."
 

Pricing and Cost Advice

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

By visitors reading reviews
Financial Services Firm
11%
Construction Company
11%
Comms Service Provider
9%
Retailer
9%
Outsourcing Company
10%
Computer Software Company
10%
Financial Services Firm
9%
Construction Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business20
Midsize Enterprise13
Large Enterprise22
 

Questions from the Community

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What needs improvement with Mimecast Email Security with Targeted Threat Protection?
There is room for improvement since new threats are emerging. Considering the availability of new features would be worthwhile. Mimecast Email Security is somewhat expensive compared to the competi...
 

Also Known As

No data available
Mimecast Email Security with Targeted Threat Protection, Mimecast Web Security, Mimecast Mailbox Continuity, Email and Collaboration Threat Protection
 

Overview

 

Sample Customers

Information Not Available
Hewlett-Packard Company (HP), Cushman and Wakefield, PIB Group, Swissport
Find out what your peers are saying about Fortra's Clearswift Secure Email Gateway vs. Mimecast Advanced Email Security and other solutions. Updated: September 2026.
912,517 professionals have used our research since 2012.