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Fortinet FortiMail vs Mimecast Email Security comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Jan 12, 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
7.4
Microsoft Defender for Office 365 enhances security, reduces costs, integrates effectively with Microsoft tools, and boosts productivity, offering significant ROI.
Sentiment score
7.7
Fortinet FortiMail improves email security, reduces costs and downtime, stabilizes communication, and offers significant financial returns.
Sentiment score
3.5
Mimecast Email Security prevents breaches and blocks phishing, significantly enhancing business security despite challenges in quantifying its ROI.
It has also decreased our time to detection and response by about 15 to 20 percent.
It offers cost savings compared to Cisco, which was very expensive.
There is definitely a return on investment when using Mimecast, as it blocks phishing emails, reducing the risk of significant financial losses.
 

Customer Service

Sentiment score
7.0
Microsoft Defender for Office 365 support is praised for responsiveness, though some users note templated responses and outdated documentation.
Sentiment score
6.5
Fortinet FortiMail support is generally responsive and competent, though experiences vary with some noting lagging in standard service.
Sentiment score
5.5
Mimecast Email Security support is responsive but often redirects to unclear articles; mixed reviews on speed and flexibility.
Customer service and support have been fantastic.
Fortinet's technical support offers high-quality support.
Support personnel are hesitant to engage in remote sessions, preferring to share documentation via email.
Mimecast technical support is generally quite good.
 

Scalability Issues

Sentiment score
8.1
Microsoft Defender for Office 365 is highly scalable and easily accommodates thousands of users without performance issues, simplifying growth.
Sentiment score
7.3
Fortinet FortiMail offers scalable solutions, efficiently handling email volumes for medium to large enterprises, despite smaller model limitations.
Sentiment score
7.9
Mimecast Email Security is scalable, adaptable, and allows easy license adjustments but may face occasional feature challenges.
 

Stability Issues

Sentiment score
7.8
Microsoft Defender for Office 365 is reliable and stable, boasting 99.9% availability and prompt resolutions to minor bugs.
Sentiment score
8.4
Fortinet FortiMail is highly stable and reliable, integrating well with platforms and resolving issues swiftly.
Sentiment score
7.5
Mimecast Email Security is praised for stability and integration, with rare downtimes, few bugs, and high user satisfaction.
 

Room For Improvement

Microsoft Defender for Office 365 requires enhancements in virus blocking, phishing detection, integration, scalability, support, and pricing transparency.
Fortinet FortiMail requires improvements in pricing, usability, deployment complexity, interface, analytics, security features, and update management.
Mimecast Email Security struggles with detection, user interface, support, costs, configurations, and database reliance, affecting overall user satisfaction.
The main area for improvement is simplifying the implementation and rollout process.
I would reduce the cost.
The area that could use some improvement in Fortinet FortiMail is the integration process.
A lot of emails were missed despite being known samples.
 

Setup Cost

Microsoft Defender for Office 365 is cost-effective for large enterprises but perceived as expensive for smaller businesses.
Fortinet FortiMail offers competitive pricing based on capacity, providing good performance despite being considered expensive by some users.
Mimecast Email Security is seen as costly, though features and updates justify the price; competitors offer cheaper alternatives.
Money-wise, it is a part of the Office 365 suite, making it slightly more expensive compared to Trend Micro.
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
 

Valuable Features

Microsoft Defender for Office 365 provides comprehensive protection with seamless integration, simplifying security management and safeguarding remote work environments.
Fortinet FortiMail delivers strong anti-spam, antivirus, phishing protection, user-friendly GUI, and excellent integration, enhancing email security effectively.
Mimecast Email Security excels in threat protection, spam filtering, and user-friendliness, with strong Microsoft 365 integration and technical support.
It ranks the threats and allows us to prioritize those hitting us the hardest, such as email threats.
Microsoft Defender for Office 365 is now part of a centralized tenant for my entire group.
Its threat detection capabilities have been beneficial.
A distinct advantage of Mimecast is its ability to block phishing and impostor attacks, which are significant threats currently.
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.
 

Categories and Ranking

Microsoft Defender for Offi...
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Average Rating
8.2
Reviews Sentiment
7.1
Number of Reviews
48
Ranking in other categories
Email Security (1st), Advanced Threat Protection (ATP) (1st), Microsoft Security Suite (11th)
Fortinet FortiMail
Average Rating
8.6
Reviews Sentiment
7.0
Number of Reviews
62
Ranking in other categories
Email Security (6th)
Mimecast Email Security
Average Rating
8.0
Reviews Sentiment
5.9
Number of Reviews
30
Ranking in other categories
Office 365 Protection (5th), Secure Email Gateway (SEG) (4th)
 

Mindshare comparison

Email Security
Secure Email Gateway (SEG)
 

Featured Reviews

Tolu Omolaja - PeerSpot reviewer
Great URL scanning and attachment scanning, but I would like more proactive threat analysis
The two main features that prove most beneficial for us are URL scanning and attachment scanning. URL scanning involves an automatic scan of links and emails. When a user clicks on a link within an email, the system promptly checks the link's safety. If the link is deemed safe, access is granted automatically. However, if it is flagged as unsafe, we receive feedback and notification to caution us about the potentially harmful link. At this point, we are presented with the option to proceed or return. I have personally witnessed the system identify a few unsafe links, making this the primary advantage of using the solution. The second crucial aspect is the scanning of attachments. When an email containing an attachment arrives, we receive a notification of the new email, along with information that the attachment is being scanned for threats. This additional layer of security provides peace of mind for our organization. While Microsoft Defender for Office 365 offers numerous features, these two stand out as particularly impressive and valuable to us.
Andras Solt - PeerSpot reviewer
Reasonable pricing and good spam filtering but does not offer robust gatekeeping
It's mainly suited for mid-size companies, not for bigger companies like us. We are more than 1,000 people. In fact, we're over 2000 users, so that's why we investigated some other products, and Clearswift, for example. We likely won't increase usage. We're looking at GFI in a year or so.
Frank Rawson - PeerSpot reviewer
It gives clients peace of mind and helps them educate their users about threats
A few years ago, our team found the implementation to be somewhat challenging. It has gotten easier as we've grown more experienced. The difficulty depends on the expertise of the person doing it. I don't work with Mimecast every day, so it might be more difficult for me than it is for one of my techs who regularly does Mimecast implementations. It requires some specific in-depth product knowledge and an understanding of email solutions. The deployment time varies. In South Africa, it depends on who you use to deploy it. If you use one of Mimecast's local partners, it can take up to two weeks because of their process. However, it's only about four to eight hours of work. After deployment, there isn't much maintenance aside from supporting and educating your customers. Users require constant education on how to use the Mimecast client and release an email that has been blocked.
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Top Industries

By visitors reading reviews
Computer Software Company
16%
Financial Services Firm
9%
Manufacturing Company
8%
Government
6%
Educational Organization
49%
Computer Software Company
8%
Financial Services Firm
5%
Government
4%
Computer Software Company
16%
Financial Services Firm
8%
Manufacturing Company
7%
Retailer
5%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Microsoft Defender for Office 365?
Threat Explorer is an invaluable tool for me, and it plays a crucial role in helping me discern the origins of variou...
What is your experience regarding pricing and costs for Microsoft Defender for Office 365?
I don't have detailed specifics on pricing, setup cost, or licensing.
What needs improvement with Microsoft Defender for Office 365?
I am generally satisfied with how it currently is. If I could improve anything, I would reduce the cost.
What is your experience regarding pricing and costs for Fortinet FortiMail?
The pricing of Fortinet FortiMail is cheaper compared to Cisco, which was quite expensive.
What needs improvement with Fortinet FortiMail?
The area that could use some improvement in Fortinet FortiMail is the integration process. I would like the integrati...
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 co...
What is your experience regarding pricing and costs for Mimecast Email Security with Targeted Threat Protection?
The pricing is higher for Mimecast, particularly for the Indian market, where it is considered expensive.
What needs improvement with Mimecast Email Security with Targeted Threat Protection?
There is nothing that notably stands out in need of improvement at present.
 

Also Known As

MS Defender for Office 365
FortiMail
Mimecast Email Security with Targeted Threat Protection
 

Overview

 

Sample Customers

Microsoft Defender for Office 365 is trusted by companies such as Ithaca College.
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.
842,388 professionals have used our research since 2012.