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Fortinet FortiMail vs Mimecast Email Security comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Nov 2, 2025

Review summaries and opinions

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

ROI

Sentiment score
6.7
Fortinet FortiMail boosts email security, reduces costs, and saves time, enhancing operational efficiency through seamless integration and advanced features.
Sentiment score
5.5
Users have mixed ROI views on Mimecast Email Security, noting its effectiveness against threats but questioning cost-efficiency.
It offers cost savings compared to Cisco, which was very expensive.
System admin at Environment Fund
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
Senior Tech. Lead at WE
 

Customer Service

Sentiment score
6.4
Fortinet FortiMail's customer service is generally praised for efficiency, especially elite support, despite occasional standard support delays.
Sentiment score
5.6
Mimecast Email Security support is helpful but has mixed reviews due to delays and reliance on indirect solutions.
I have direct communication with Kenyan system engineers and local support in Ethiopia, enabling good support.
Network & Security Engineer at Malam Engineering PLC
Mainly, they are focusing on Fortinet FortiMail and FortiAnalyzer, where the support engineers are very good.
Head of the IT Security Division at a tech services company with 11-50 employees
Fortinet's technical support offers high-quality support.
System admin at Environment Fund
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Senior Tech. Lead at WE
Mimecast technical support is generally quite good.
Information Security Analyst at Enfield Central Library
I would rate my experience with technical support of Mimecast Email Security between seven and eight out of ten for their support.
Email Security Engineer at Logic Infosecurity
 

Scalability Issues

Sentiment score
7.2
Fortinet FortiMail is scalable and flexible, efficiently adapting to varying organizational sizes, though some hardware limitations exist.
Sentiment score
7.0
Mimecast Email Security is praised for adaptability and scalability, supporting various industries despite minor feature challenges.
The scalability of Fortinet FortiMail depends on whether you are buying a virtualized license, which allows for a scalable pay-as-you-go model, or if you are buying a box.
Head of the IT Security Division at a tech services company with 11-50 employees
Fortinet FortiMail is scalable and can be expanded in large environments.
Senior Associate at a tech vendor with 10,001+ employees
If Mimecast Email Security introduces API solutions, it will dominate the market.
Email Security Engineer at Logic Infosecurity
 

Stability Issues

Sentiment score
8.3
Fortinet FortiMail is highly stable and reliable, with rare issues quickly resolved and seamless integration with other Fortinet tools.
Sentiment score
7.5
Mimecast Email Security is reliable and stable, with minimal glitches, occasional delays, and high user ratings for performance.
This stability is consistent across Fortinet products, including FortiGate firewall.
Network & Security Engineer at Malam Engineering PLC
They confirm it's a good solution where only one or two rare emails get through, while the rest are properly blocked without any issues.
Email Security Engineer at Logic Infosecurity
 

Room For Improvement

Fortinet FortiMail needs a more intuitive interface, better integration, enhanced security, simpler encryption, and improved spam filtering.
Mimecast Email Security needs improvements in pricing, detection, complexity, user interface, support, and reducing false positives and attachment issues.
The transition from on-premises devices to virtual appliances may be necessary as more organizations migrate email services to the cloud.
Head of computer systems at Indian Institute of Space Science & Technology(IIST)
There are also false positives issues, especially with signed PDF attachments.
Senior Associate at a tech vendor with 10,001+ employees
Providing comprehensive documentation on how to deploy and configure would improve the solution.
Network & Security Engineer at Malam Engineering PLC
A lot of emails were missed despite being known samples.
Senior Tech. Lead at WE
Mimecast Email Security is somewhat expensive compared to the competition in the Indian market.
Co-Founder & VP-Sales at QuantumShield Technologies LLP
We discussed the phishing aspect, the DNS system, and the key rotation.
Senior Security Engineer at ManpowerGroup
 

Setup Cost

Fortinet FortiMail offers competitive, scalable pricing with flexible licensing, valued for performance and security despite some expense concerns.
Mimecast Email Security is often seen as costly due to user-based licensing and added fees, despite potential discounts.
Fortinet FortiMail is considered overpriced by Indian rupee standards.
Head of computer systems at Indian Institute of Space Science & Technology(IIST)
The setup cost is a little bit costly.
Senior Associate at a tech vendor with 10,001+ employees
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
Senior Tech. Lead at WE
 

Valuable Features

Fortinet FortiMail excels in email security with user-friendly features, advanced threat protection, and seamless integration with Fortinet products.
Mimecast Email Security offers strong threat protection, easy setup, seamless Microsoft 365 integration, and excellent scalability and support.
Its threat detection capabilities have been beneficial.
System admin at Environment Fund
Fortinet FortiMail has valuable features such as on-premises deployment and click protection, and it is working properly.
Head of the IT Security Division at a tech services company with 11-50 employees
Fortinet FortiMail offers capabilities like settings for mail delivery, mail filtering, spam controls, and email bursting prevention.
Head of computer systems at Indian Institute of Space Science & Technology(IIST)
One of the most useful features is the threat remediation module, which can be used to remove malicious emails that may have been delivered or manually remove them.
Information Security Analyst at Enfield Central Library
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
Senior Tech. Lead at WE
Mimecast Email Security includes the best gateway solution across all Cisco, Trend Micro, and other solutions.
Email Security Engineer at Logic Infosecurity
 

Categories and Ranking

Fortinet FortiMail
Average Rating
8.6
Reviews Sentiment
6.9
Number of Reviews
67
Ranking in other categories
Email Security (6th)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
5.9
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. Fortinet FortiMail is designed for Email Security and holds a mindshare of 3.5%, down 5.5% compared to last year.
Mimecast Email Security, on the other hand, focuses on Secure Email Gateway (SEG), holds 14.4% mindshare, up 12.5% since last year.
Email Security Market Share Distribution
ProductMarket Share (%)
Fortinet FortiMail3.5%
Microsoft Defender for Office 3659.6%
Proofpoint Email Protection7.9%
Other79.0%
Email Security
Secure Email Gateway (SEG) Market Share Distribution
ProductMarket Share (%)
Mimecast Email Security14.4%
Microsoft Defender for Office 36524.2%
Proofpoint Email Protection20.3%
Other41.099999999999994%
Secure Email Gateway (SEG)
 

Featured Reviews

Abhimanyu Das - PeerSpot reviewer
Senior Associate at a tech vendor with 10,001+ employees
Targeted email filtering has reduced spam and phishing and now saves significant investigation time
The best features of Fortinet FortiMail include its techniques and tactics, which are highly effective compared to other solutions such as Microsoft 365. Although Fortinet FortiMail may not be as advanced in some aspects, it is well recognized for its strong performance in handling spam and phishing. It performs thorough mail scanning and also offers a sandboxing feature that enhances protection. Fortinet FortiMail has had a positive impact on my organization by significantly reducing unwanted email activities such as spam and phishing. It provides accurate detection and generates results that often exceed what can be achieved through manual analysis. Since deploying Fortinet FortiMail, I have observed a reduction in investigation time by at least 20 to 30 percent.
HS
Email Security Engineer at Logic Infosecurity
Experience high detection and user-friendly policies with reliable email security implementation
The system is not user-friendly because you have to create policies that are mapped in a dictionary. As an IT engineer, I understand how it works, but explaining it to another IT person can be difficult. Having more user-friendly dashboards would improve the work experience. In Mimecast Email Security, checking policies in the dictionary or gateway is very complicated, and not everyone understands this process. If you examine the Check Point portal, it's user-friendly with easily accessible tabs that anyone can explore. With Mimecast Email Security, making changes might impact existing mailboxes. The portal is complicated compared to Check Point's user-friendly interface.
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Top Industries

By visitors reading reviews
Computer Software Company
13%
Financial Services Firm
9%
Manufacturing Company
7%
Government
6%
Computer Software Company
14%
Financial Services Firm
8%
Manufacturing Company
6%
Comms Service Provider
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business32
Midsize Enterprise22
Large Enterprise15
By reviewers
Company SizeCount
Small Business17
Midsize Enterprise7
Large Enterprise11
 

Questions from the Community

What needs improvement with Fortinet FortiMail?
In my opinion, points for improvement for Fortinet FortiMail include sometimes the speed and fine-tuning the false positive problems, especially with the signed PDF attachments and the whitelist an...
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?
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

FortiMail
Mimecast Email Security with Targeted Threat Protection
 

Overview

 

Sample Customers

Magromer Cueros y Pieles S.A.
Azizi Developments, Affinity Credit Union, Aftercare, Al Abbar Group
Find out what your peers are saying about Fortinet FortiMail vs. Mimecast Email Security and other solutions. Updated: January 2024.
879,927 professionals have used our research since 2012.