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Fortinet FortiMail vs Mimecast Advanced Email Security comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Feb 8, 2026

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
6.4
Fortinet FortiMail enhances email security with cost savings, reduced spam, efficient management, robust features, and improved productivity.
Sentiment score
5.2
Organizations find it hard to measure ROI from Mimecast's security, despite strong threat protection and appreciated features.
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
The ROI which companies see should be able to justify buying Mimecast Advanced Email Security.
Solution Architect Cybersecurity at Microland Limited
 

Customer Service

Sentiment score
6.5
Fortinet FortiMail support is praised for responsiveness and expertise but criticized for variability based on region and tier.
Sentiment score
5.4
Mimecast Advanced Email Security's customer service is generally rated highly, with prompt support but some concerns about flexibility and communication.
I have direct communication with Kenyan system engineers and local support in Ethiopia, enabling good support.
CTO 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
The customer support for Mimecast Advanced Email Security is excellent.
Manager - EUC at Finthrive
We instantly get customer support from Mimecast Advanced Email Security whenever there is a requirement.
System Engineer II at a media company with 5,001-10,000 employees
 

Scalability Issues

Sentiment score
7.1
Fortinet FortiMail is scalable for various environments, suitable for mid-sized to enterprise users with virtual and on-premise options.
Sentiment score
7.0
Mimecast Advanced Email Security offers high scalability, managing large user increases and email volumes efficiently across various organization sizes.
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 Cybersecurity Engineer at Kyndryl
It handles email flow very smoothly, and we never face any issues with email delivery as our organization grows or email volume increases.
System Engineer II at a media company with 5,001-10,000 employees
If Mimecast Email Security introduces API solutions, it will dominate the market.
Email Security Engineer at Logic Infosecurity
While our user base remains around 2,200, I believe it can adapt to much larger requirements as needed, based on discussions with others managing larger organizations.
Manager - EUC at Finthrive
 

Stability Issues

Sentiment score
8.3
Fortinet FortiMail is highly rated for stability, reliability, effective spam handling, and seamless integration, requiring minimal fine-tuning.
Sentiment score
7.6
Mimecast Advanced Email Security is praised for stability and effectiveness, despite occasional downtime and login issues.
This stability is consistent across Fortinet products, including FortiGate firewall.
CTO 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
The issues we did have were causing quite a lot of problems.
IT Manager at a logistics company with 201-500 employees
Mimecast Advanced Email Security is a good product and is very stable.
Solution Architect Cybersecurity at Microland Limited
 

Room For Improvement

Fortinet FortiMail requires interface refinement, improved features, better documentation, and enhanced integration with advanced threat detection and Fortinet’s ecosystem.
Mimecast needs improvements in customer support, interface, spam filtering, training resources, pricing, and administrative simplicity to enhance user experience.
Providing comprehensive documentation on how to deploy and configure would improve the solution.
CTO at Malam Engineering PLC
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 Cybersecurity Engineer at Kyndryl
When you buy an XDR provider, they give you a complete holistic story around it, showing what has happened, which email somebody has clicked on, whether there have been any changes, and whether there is any network activity.
Solution Architect Cybersecurity at Microland Limited
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
 

Setup Cost

Fortinet FortiMail offers competitive appliance-based pricing, with flexibility and reliability, though higher than open-source alternatives.
Mimecast Advanced Email Security is seen as costly, compared to competitors, particularly in price-sensitive markets like India.
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 Cybersecurity Engineer at Kyndryl
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
Senior Tech. Lead at WE
Regarding the price, I think that in terms of similar products, it is pretty much in the same line, so I think it's reasonable.
IT Manager at a logistics company with 201-500 employees
Overall, my experience with pricing, setup costs, and licensing was smooth.
Manager - EUC at Finthrive
 

Valuable Features

Fortinet FortiMail provides strong security, usability, scalability, and performance for email threat detection and content control in diverse environments.
Mimecast Advanced Email Security offers robust threat protection, easy configuration, scalability, and seamless integration with Microsoft 365 for enhanced security.
Its threat detection capabilities have been beneficial.
System admin at Environment Fund
The most valuable features are Fortinet FortiMail's ability to protect from advanced features of email-based attacks, including protection against ransomware and malware attacks.
CTO at Malam Engineering PLC
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)
There was a signature phishing scam on the internet, but Mimecast Advanced Email Security caught it before it came to fruition and instantly blocked that signature-based phishing scam.
System Engineer II at a media company with 5,001-10,000 employees
It easily generates reports about the kinds of emails coming in weekly and classifies them into various categories, making it very helpful to analyze and ensure our email gateway remains safe and secure by updating all security patches.
Senior Managing Consultant at a tech vendor with 10,001+ employees
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
Senior Tech. Lead at WE
 

Categories and Ranking

Fortinet FortiMail
Ranking in Email Security
5th
Average Rating
8.6
Reviews Sentiment
6.8
Number of Reviews
68
Ranking in other categories
No ranking in other categories
Mimecast Advanced Email Sec...
Ranking in Email Security
4th
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
44
Ranking in other categories
Email Archiving (2nd), Office 365 Protection (2nd), Secure Email Gateway (SEG) (3rd)
 

Mindshare comparison

As of August 2026, in the Email Security category, the mindshare of Fortinet FortiMail is 2.7%, down from 4.0% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 4.0%, down from 5.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Email Security Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security4.0%
Fortinet FortiMail2.7%
Other93.3%
Email Security
 

Featured Reviews

Abhimanyu Das - PeerSpot reviewer
Senior Cybersecurity Engineer at Kyndryl
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.
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.
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Top Industries

By visitors reading reviews
Construction Company
9%
Financial Services Firm
9%
Manufacturing Company
8%
Computer Software Company
8%
Computer Software Company
10%
Financial Services Firm
9%
Outsourcing Company
9%
Construction Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business33
Midsize Enterprise23
Large Enterprise14
By reviewers
Company SizeCount
Small Business19
Midsize Enterprise12
Large Enterprise20
 

Questions from the Community

What needs improvement with Fortinet FortiMail?
I think they should improve Fortinet FortiMail on-premises by enhancing its user interface. Additional features they could have in the future would include advanced analytics capabilities. I do thi...
What is your primary use case for Fortinet FortiMail?
I do have a partnership with Fortinet. I have been both a partner and reseller.
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, Mimecast Web Security, Mimecast Mailbox Continuity, Email and Collaboration Threat Protection
 

Overview

 

Sample Customers

Magromer Cueros y Pieles S.A.
Hewlett-Packard Company (HP), Cushman and Wakefield, PIB Group, Swissport
Find out what your peers are saying about Fortinet FortiMail vs. Mimecast Advanced Email Security and other solutions. Updated: August 2026.
911,549 professionals have used our research since 2012.