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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
4th
Average Rating
8.2
Reviews Sentiment
5.9
Number of Reviews
49
Ranking in other categories
Email Archiving (1st), Office 365 Protection (2nd), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of October 2026, in the Email Security category, the mindshare of Fortra's Clearswift Secure Email Gateway is 1.3%, up from 0.9% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 3.9%, down from 5.5% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security3.9%
Fortra's Clearswift Secure Email Gateway1.3%
Other94.8%
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

"Ability to create your own content-filtering policies with relative ease."
"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."
"A stable solution."
"Go for it! I think it's an excellent product with great technical support."
"The security is pretty good, and that's why we're going to upgrade to an even more advanced package. We used it when we had a power issue, and it works. It has been pretty reliable, and the support has been quite good."
"The solution is stable and reliable; there are no bugs or glitches, and it doesn't crash or freeze."
"I would rate Mimecast Email Security a nine out of ten."
"Mimecast Advanced Email Security positively impacts my organization by filtering spam emails."
"Mimecast certainly helped my customers reduce phishing emails."
"Mimecast Advanced Email Security has state-of-the-art features and is very sophisticated compared to other partners."
"My advice to those considering this product would be to go for it."
"If you want the ease of use, then Mimecast, or at least a cloud solution, is the way to go."
 

Cons

"FTP server and TRUST Manager functionality."
"Malware needs improvement."
"I am not satisfied with Clearswift because of the lack of customer support."
"They should improve the cookies management feature."
"The product's interface could be improved to be more user-friendly."
"The installation is not so straightforward."
"The interface and the documentation could be improved. They can also include some more training resources and content like video. While setting things up, I had to search for the information quite a bit. It took me time to find the correct way to do something. The information is there, but it is sort of all over the place. They can create a better help knowledge base or help portal. It retains your email for 45 days. They can maybe increase this duration."
"I'd like to have better support from the product in the future."
"The system is not user-friendly because you have to create policies that are mapped in a dictionary."
"The reaction time between a new threat being identified and Mimecast picking it up needs to be narrowed a bit."
"The price could be better, it should be reduced."
 

Pricing and Cost Advice

Information not available
"The licensing costs are per-user for the product that you get with them."
"Its price is in the middle range. It is a structured licensing model where there are various components that you can add or choose to add or not."
"The product has good pricing in terms of return on investment."
"The customers can select the license packages as per their requirements."
"I'm always going to say the price needs to be lower, but it's reasonable."
"Two subscription options are currently offered: monthly and yearly. My suggestion is to opt for the yearly subscription as it can give some discount. The pricing isn't high as other cloud solutions are pricier than Microsoft's offerings."
"It's an expensive solution."
"It is a bit expensive."
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Top Industries

By visitors reading reviews
Construction Company
12%
Financial Services Firm
11%
Retailer
10%
Comms Service Provider
8%
Outsourcing Company
10%
Computer Software Company
9%
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 Business23
Midsize Enterprise12
Large Enterprise23
 

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.
918,970 professionals have used our research since 2012.