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Kiteworks vs Mimecast Advanced Email Security comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Jun 2, 2026

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

Kiteworks
Ranking in Email Security
27th
Ranking in Secure Email Gateway (SEG)
9th
Average Rating
8.6
Reviews Sentiment
6.9
Number of Reviews
13
Ranking in other categories
Enterprise Content Management (16th), Managed File Transfer (MFT) (7th), Content Collaboration Platforms (14th)
Mimecast Advanced Email Sec...
Ranking in Email Security
4th
Ranking in Secure Email Gateway (SEG)
3rd
Average Rating
8.2
Reviews Sentiment
5.9
Number of Reviews
49
Ranking in other categories
Email Archiving (1st), Office 365 Protection (2nd)
 

Mindshare comparison

As of October 2026, in the Secure Email Gateway (SEG) category, the mindshare of Kiteworks is 2.4%, up from 0.9% compared to the previous year. The mindshare of Mimecast Advanced Email Security is 14.1%, up from 12.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Secure Email Gateway (SEG) Mindshare Distribution
ProductMindshare (%)
Mimecast Advanced Email Security14.1%
Kiteworks2.4%
Other83.5%
Secure Email Gateway (SEG)
 

Featured Reviews

KT
Associate Consultant at a tech consulting company with 10,001+ employees
Streamlined global file sharing with user-friendly interface and self-service capabilities
I'm not a network expert, however, there must be some room for improvement. Perhaps there could be a notification to users about their bandwidth or network packet loss. If users receive such notifications, they can understand any disruptions are due to issues with their network or bandwidth rather than the site or Kiteworks. Additionally, I work from offshore India, and I told my client manager to communicate with the Kiteworks forum salesman regarding one feature. I noticed the Kiteworks login UI is very basic, lacking customization. Allowing more HTML tags to add hyperlinks or user-friendly information on the home page would be very useful.
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

"The top two features are the two-factor authentication, which is pretty good. It's easily understood by the users. And their API is rather robust. We have numerous integrations that work off the API."
"The most valuable aspect of Kiteworks is undoubtedly the private content network. This feature is particularly beneficial for us. Furthermore, it serves as a centralized platform that enables us to track and manage our information exchange."
"The most valuable feature is the ability to send a large file of 30 GB in size and more. In Outlook and other email applications, you cannot send files that are larger than 20 MB. But with Kiteworks, 30 GB is transferable by default and, with the proper approval, a file of up to 100 GB can be sent. It makes file transfer very easy and smooth."
"The solution removes the limitations with file attachment size that is found with regular email."
"It’s a great product that you should seriously consider and take the first step by training."
"The solution can be used remotely, including from mobiles, and it's easy to upload and share files."
"I like Kiteworks or Accellion because it's continuously upgraded. I also know that it probably works with a lot of clients."
"I can identify from which region our users are uploading or downloading files."
"Mimecast Advanced Email Security has state-of-the-art features and is very sophisticated compared to other partners."
"The setup was easy."
"The platform's most valuable features are journaling and email archiving, effectively stopping phishing attacks."
"Mimecast Advanced Email Security has positively impacted our organization by securing our environment better than before compared to what we used to configure earlier to deliver the email."
"URL inspection works pretty well."
"We like the content filtering and secure messaging features."
"The product's most valuable features are impersonation protection and phishing countermeasures."
"It's good, it keeps the spam out, and it does a really good job at not allowing threats through."
 

Cons

"I would like to see immediate releases of fixes because now it takes at least a week. If that time span can be reduced to one day or two days, that would be very helpful for users so that things are sorted and transactions work smoothly."
"I noticed the Kiteworks login UI is very basic, lacking customization. Allowing more HTML tags to add hyperlinks or user-friendly information on the home page would be very useful."
"It could be more stable. In the next release, it would be better if it was more stable with improved performance."
"The one feature, which I have also requested directly to Kiteworks, is to have a scheduled upgrade function. Currently, one of my engineers logs in after hours for the upgrade. We're a hospital, and we're 24/7, but the primary users are seven to five. So, we log in the early evening just to push a button to tell it to do the update. It would be nice if that could be very easily scheduled."
"It would be nice if Kiteworks could provide a free version of the platform so that it could be used for a certain number of file transfers. We could be charged a fee if we exceeded the number of allotted file transfers."
"The system is extremely stable, but because it is a "COTS" system access is restricted and you must use the solution's support to make even simple changes, which increases the downtime."
"We have experienced some issues with stability due to bugs."
"We mainly had stability issues with kiteworks, where we were pushing the limits of its capability."
"This solution can be frustrating. It blocks many things that should be going through."
"The attachment scanning feature doesn't work properly."
"It analyzes patterns but sometimes overlooks suspicious indicators."
"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."
"The solution's console interface was recently changed for the admins, but the previous one was much better because we could open tabs on it."
"Mimecast Advanced Email Security is adequate, but it has remained the same since the last two years with not much research and development."
"The detection rates are an area for improvement."
"The price of the solution is expensive. It can improve by reducing the price."
 

Pricing and Cost Advice

"The price of Kiteworks is reasonable."
"The solution is very expensive because we are buying with Malaysian Ringgit and it's sold in US dollars."
"They changed it midstream. We were being charged a certain flat rate for SFTP traffic. For whatever reason, at the beginning of the year, our pricing changed, and we are now being charged more for using a feature of the product than we were when we first bought it. That has been our experience with billing. It turned out to be more expensive than when we started with it."
"It is not really expensive. I mean, to me it's obviously expensive, but it's worth it."
"The license management is changing and confusing. If I could make one change to it, it would be better license management through the API."
"I believe it's a little costly, but given the faith that we put into it from a security perspective to maintain the integrity of our patient information that is being transferred through this system, that's a small price to pay. So, on the surface, it might look like a lot of money, but depending on the need for security, which is where we feel it shines, it's okay price-wise."
"I'm always going to say the price needs to be lower, but it's reasonable."
"The price of Mimecast Mailbox Continuity is expensive."
"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."
"Compared to the other solutions in the market, Mimecast Email Security with Targeted Threat Protection's pricing is fine."
"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."
"On a scale of one to ten, where one is cheap, and ten is expensive, I rate the pricing a ten."
"Compared to the other products in the market, it is neither cheap but nor very expensive. I would rate it somewhere in the middle, 5 out of 10."
"For what it is, the product is overpriced."
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Top Industries

By visitors reading reviews
Financial Services Firm
12%
Comms Service Provider
10%
Government
10%
Manufacturing Company
8%
Outsourcing Company
10%
Computer Software Company
9%
Financial Services Firm
9%
Manufacturing Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business3
Large Enterprise11
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise12
Large Enterprise23
 

Questions from the Community

What is Kiteworks?
Kiteworks is a secured file sharing platform that enables users to collaborate with different parties across a robust offering of secured protected channels. Users have the option of virtual privat...
What needs improvement with Kiteworks?
I'm not a network expert, however, there must be some room for improvement. Perhaps there could be a notification to users about their bandwidth or network packet loss. If users receive such notifi...
What advice do you have for others considering Kiteworks?
Scalability is impressive. It can be highly available, resilient, and scalable infrastructure. I can confidently give it a nine. It suits any level of organization, whether a small setup with two a...
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

Accellion
Mimecast Email Security with Targeted Threat Protection, Mimecast Web Security, Mimecast Mailbox Continuity, Email and Collaboration Threat Protection
 

Overview

 

Sample Customers

United States Securities and Exchange Commission, National Health Service, Husch Blackwell LLP, NYC Health + Hospitals, Viatris, MITRE Corporation, Chubb, Kraft Heinz, KPMG, Kohler, National Institute of Standards and Technology, Purdue Pharma, AVL
Hewlett-Packard Company (HP), Cushman and Wakefield, PIB Group, Swissport
Find out what your peers are saying about Kiteworks vs. Mimecast Advanced Email Security and other solutions. Updated: October 2026.
919,894 professionals have used our research since 2012.