--- title: Mimecast Advanced Email Security Reviews meta_title: 'Mimecast Advanced Email Security Reviews 2026: Details, Pricing, & Features | G2' meta_description: Filter 374 reviews by the users' company size, role or industry to find out how Mimecast Advanced Email Security works for a business like yours. aggregate_rating: rating_value: 4.4 review_count: 374 scale: '5' date_modified: '2026-10-24' parent_category: name: Email Security url: https://www.g2.com/categories/email-security ---

Mimecast Advanced Email Security Pros and Cons: Top 5 Advantages and Disadvantages

Quick AI Summary Based on G2 Reviews

Generated from real user reviews

Users value the advanced AI-driven threat protection of Mimecast, significantly enhancing email security and user awareness. (40 mentions)
Users find Mimecast exceptionally easy to implement and manage, appreciating its seamless integration and reliability for email security. (36 mentions)
Users commend Mimecast for its robust email security, effectively preventing spoofing and protecting against dangerous attachments. (28 mentions)
Users praise the powerful security features of Mimecast Advanced Email Security, enhancing protection and ease of use. (22 mentions)
Users appreciate the spam blocking capability of Mimecast, effectively preventing breaches and ensuring email security. (22 mentions)
Users note the complexity of Mimecast's interface, making it challenging for new administrators to fully utilize. (17 mentions)
Users face email filtering issues with Mimecast, struggling to locate emails and manage extensive policies effectively. (16 mentions)
Users often face email policy configuration issues, leading to time-consuming adjustments and frustrations with usability. (16 mentions)
Users find the false positives in Mimecast frustrating, as they can delay important communications and require manual intervention. (13 mentions)
Users report ineffective detection of legitimate emails, leading to disruptions and time-consuming manual interventions. (13 mentions)

5 Pros or Advantages of Mimecast Advanced Email Security

5 Cons or Disadvantages of Mimecast Advanced Email Security

Mimecast Advanced Email Security Reviews (374)

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Reviews

Mimecast Advanced Email Security Reviews (374)

View 3 Video Reviews
4.4
374 reviews
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Verified User in Legal Services
AL
Verified User in Legal Services
Mid-Market (51-1000 emp.)
"Mimecast is a defensive email application"
3.5/5
What do you like best about Mimecast Advanced Email Security?

The fact is blocks emails that otherwise would hit the network and could cause damage Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The fact that email security has to be put into policies and if policies are not properly done you can have serious issues! Review collected by and hosted on G2.com.

DA
David A.
Director of IT and Cybersecurity
Mid-Market (51-1000 emp.)
"wonderful and refreshing"
5/5
What do you like best about Mimecast Advanced Email Security?

Great UI and easy to navigate, quick learning curve. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The setup is a bit annoying as we switched over, it seemed spam mail got through alot in the beginng and some emails that should get through did not. Review collected by and hosted on G2.com.

RH
Rick H.
Network Administrator
Mid-Market (51-1000 emp.)
"Mimecast Cloud Archive has been a great solution to have all of our emails archived"
4.5/5
What do you like best about Mimecast Advanced Email Security?

Updates are easily applied and journaling has not been interrupted since our initial setup. Customer support has always been helpful and responsive. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Since the initial setup of Exchange to journal to Mimecast, we have had only a couple issues. Journaling was not interrupted. The issue was with the folder sync so that users could see their inbox as it is in Outlook. Review collected by and hosted on G2.com.

BH
Bill H.
Executive Chairman
Small-Business (50 or fewer emp.)
"Mimecast Might Be the Worst Enterprise Software Ever"
0/5
What do you like best about Mimecast Advanced Email Security?

Nothing good to say. The service has not only been useless but counterproductive since the day we installed it. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

1) It blocks an incredible amount of easily identifiable legitimate emails including clients, from family members and - this is the best - emails from the company that installed it on our servers. 2) It has ignored every whitelist request we've given it & 3) customer support is non-existent. I honestly don't understand how anyone with business accountability can allow this software to exist in their organization (we are removing it). Review collected by and hosted on G2.com.

MA
Mohamed A.
Senior Network Engineer
Mid-Market (51-1000 emp.)
"Nice and Apt"
5/5
What do you like best about Mimecast Advanced Email Security?

Among many, the most helpful features are impersonation, URL protection, Anti-Spoofing and Attachment control. The upside is the control and visibility of malicious/suspicious emails like spam, attachments and suspicious links. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The least helpful is the limited log and mail retention period, which is 30 days by default. The downside which faces is that granular filtration doesn't function as expected. Review collected by and hosted on G2.com.

Verified User in Non-Profit Organization Management
AN
Verified User in Non-Profit Organization Management
Mid-Market (51-1000 emp.)
"I always feel safe with Mimecast in front of my Email Flow!!!"
5/5
What do you like best about Mimecast Advanced Email Security?

This is truly set it and forget it! Support is always there to provide guidance for any issues. Working with the team is pleasant and always fruitful. I have zero complaints after over 8 years working with directly. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

There isn't much I dislike. Documentation can be a little cumbersome, but support is always there to assist! Review collected by and hosted on G2.com.

DD
D D.
CTO
Mid-Market (51-1000 emp.)
"Mimecast is awesome and helps us block out emails we do not need!"
4.5/5
What do you like best about Mimecast Advanced Email Security?

Held mimecast digest is great too if you need something Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The rejected emails do not make it to the server! I would like to review if possible sometimes blocks for nothing Review collected by and hosted on G2.com.

MT
Melissa T.
ICT Manager
Mid-Market (51-1000 emp.)
"Balancing Security and Usability - Mimecast's Strengths and Challenges"
3.5/5
What do you like best about Mimecast Advanced Email Security?

Overall, I value the security, flexibility, and user-friendly nature of Mimecast Advanced Email Security. It is a powerful tool for protecting email communications. It allows me to set customised policies that align with my firm's specific needs. Whether it's scanning attachments, monitoring URLs, or filtering emails based on specific content, the flexibility is excellent. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Mimecast sometimes flags legitimate emails as suspicious, leading to delays in communication. While it’s good at catching threats, managing false positives can become tedious. While the interface is generally intuitive, new users can face a learning curve, particularly in understanding the more nuanced security policies and tools within the platform. Training or familiarisation may be required to fully leverage its potential. There are some advanced configurations that can feel quite complex. Setting up intricate rules can be more time consuming and require more expertise than expected. Review collected by and hosted on G2.com.

RD
Rod D.
IT Director
Mid-Market (51-1000 emp.)
"Amazing product, friendly interface, zero account management"
4.5/5
What do you like best about Mimecast Advanced Email Security?

The best thing about Mimecast is how easy it is to manage and implement. From all the basics of emails protection like allow/deny lists, to more advanced features like greylist checks and DMARC rules, it does all from a very friendly interface and once you get used to its logic, the daily usage of IT admins, to the sporadic use by end users just makes this product probably the best in class on its market. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The only caveat to something so ease to integrate and manage is the customer support and account management that is often lacking. Customer support is not always helpful, or will only provide a link to their knowledgebase rather than helping with troubleshooting, and it's very hard to find anyone on the account management side of the house that can be a point of contact for escalations, renewals, and so on. Review collected by and hosted on G2.com.

Drew B.
DB
Drew B.
Systems Administrator
Mid-Market (51-1000 emp.)
"It's amazing how many emails it stops for us!"
5/5
What do you like best about Mimecast Advanced Email Security?

The automated spam screening is probably the best feature as I do not need to worry about emails that fail graylisting, are in RBL, ones that Mimecast detects as having spam content, and email addresses/domains that users themselves want to be blocked.

The customisation of the policies is fantastic too and really allows us to easily finetune what actions we want taking on certain emails and allows us to override it when we do not want action to be taken.

Customer support is really good and the documentation available is useful. I have also completed the Mimecast University and I would recommend this to anyone who is administrating Mimecast.

The large file send and secure message send are part of our business practices now and we feel safe knowing that these types of emails are sent correctly and securely, and with automatically generated instructions to the recipients so we don't need to explain to them what to do. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The upgrades last year to the administrator console were in my opinion a bit of a downgrade. I have given it time to settle in my mind, but I liked having the tabs open rather than having to open a tab on my browser. Review collected by and hosted on G2.com.