--- 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)

View 3 Video Reviews
Reviews

Mimecast Advanced Email Security Reviews (374)

View 3 Video Reviews
4.4
374 reviews
Search reviews
Filter Reviews
Clear Results
G2 reviews are authentic and verified.
CC
Calvin C.
IT Director
Mid-Market (51-1000 emp.)
"Mimecast gives us the best chance to defend email threats"
4.5/5
What do you like best about Mimecast Advanced Email Security?

The fact that Mimecast is a SEG (Secure email gateway) solution which protects both on-prem and cloud email platform. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

The admin console is rich but sometimes a bit slow. Review collected by and hosted on G2.com.

DS
Dan S.
IT Manager
Mid-Market (51-1000 emp.)
"Seemless implemenation and Powerful Product"
5/5
What do you like best about Mimecast Advanced Email Security?

With the guided help of an implemenation engineer, Mimecast Advanced Email Security was hassle free to implement along side of O365. The product has a seemingly endless array of products and services all of which work just as well as the next. Mimecast enabled us to remove our old non-functional email security product taking us to a new strength of email security. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

There isn't really much to dislike about the product. It's simple to operate even for a non IT user. Review collected by and hosted on G2.com.

JS
Josh S.
Office Manager
Small-Business (50 or fewer emp.)
"Great Product and have been using it for years."
4.5/5
What do you like best about Mimecast Advanced Email Security?

Easy to use, support is great. I have been using them for years and this is why. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

We still get phishing emails coming in. This is such a hard product to have because the bad actors are trying to break things as fast as you are trying to keep things going. Review collected by and hosted on G2.com.

Verified User in Civic & Social Organization
AC
Verified User in Civic & Social Organization
Mid-Market (51-1000 emp.)
"Great products, easy to use, great documentation, support, and customer service"
5/5
What do you like best about Mimecast Advanced Email Security?

Knowledgebase is very extensive so we can self-serve a lot. But if we need to we can contact support and they are very good at responding. Lots of focus on improving products as well as customer service. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

There's not really any bad incidents that I can think of to label a 'dislike'. Review collected by and hosted on G2.com.

PW
Peter W.
IT Infrastructure Support Technician
Mid-Market (51-1000 emp.)
"Does what it's built to do."
5/5
What do you like best about Mimecast Advanced Email Security?

Retention of every email sent/received. Filters and rules that work. You get what you are meant to! Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Since their new UI change, some things still don't work, like feature request / feedback button still doesn't work. Sometimes the filter / spam rules are a bit strict with no explanation as to why. Review collected by and hosted on G2.com.

DB
Dylan B.
System Administrator
Mid-Market (51-1000 emp.)
"The best email filtering solution on the market!"
5/5
What do you like best about Mimecast Advanced Email Security?

Good detection rates and very low false positives. Constantly getting updated with new features and capabilities. Good outlook integration Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

New menu & cosmetic designs in the administration side aren't always better, and some have made it significantly worse. Review collected by and hosted on G2.com.

Verified User in Pharmaceuticals
AP
Verified User in Pharmaceuticals
Mid-Market (51-1000 emp.)
"Generally a solid core product but support and onboarding are mediocre"
3.5/5
What do you like best about Mimecast Advanced Email Security?

The security gateway is a very robust and highly customizable solution. Once you have it up and running it functions quite well and does a good job of stopping threats. It layers well with Google Workspaces, once you have it up and running.

Users find the security awareness training videos quite entertaining and the short format helps with compliance.

Users find it fairly easy to self-service their quarantines after a little training, saving on admin work. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Support is knowledgeable but I get the impression they are very overtaxed. The onboarding process was a slog, we purchased the integration assistance, but it took weeks for our implementation specialist to actually reach out to us, by that time we had already started configuring the product ourselves. I would strongly recommend purchasing the implementation assistance, especially if you plan to use this with Google Workspaces. It's a rather involved process and you're going to have a bad time if (when) something goes wrong as the implementation docs are rather terse.

The product also requires quite a lot of fine-tuning and adjustment in the first few weeks, so expect some degree of complaints from your users. Again, having the assistance of the implementation specialist is key here otherwise you'll need to deal with T1 support which is not always the most helpful or responsive.

The SAT dashboards are pretty but a bit sparse. Getting simple information like a list of non-compliant users is more work than it should be.

Google Workspace integration is also a little bare-bones. It would be nice for users to be able to report messages via the Gmail interface instead of the Mimecast portal. Review collected by and hosted on G2.com.

Wade C.
WC
Wade C.
Information Security & User Experience
Mid-Market (51-1000 emp.)
"Robust enterprise email security solutions"
4.5/5
What do you like best about Mimecast Advanced Email Security?

Mimecast advanced email Security gives me peace of mind knowing that our associate's mailboxes are protected against malicious email threats and attempts to disrupt our business. Having email filtering, encryption and archiving all in one solution just makes sense. Mimecast support and account managers have always taken care of us to ensure our solution is configured and functioning as intended. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Admittingly, it's not the easiest solution to manage, but the more time you spend in it the easier it is to administer and understand for a system as complex as it is. Review collected by and hosted on G2.com.

Verified User in Hospitality
AH
Verified User in Hospitality
Enterprise (> 1000 emp.)
"Overall a strong product with a mostly hands off approach."
4/5
What do you like best about Mimecast Advanced Email Security?

The product as a whole integrates well into our environment and does a very good job of detecting possible threats and scanning URLs. For end users and for most aspects of its configuration it has a high ease of use and ease of implementation. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

When hands-on intervention is needed, the organization of their UI could be much better as it is confusing at times where to go to resolve the issue as many dashboards have similar names/functions but are just different enough to not work the way you expect. Customer support is also usually slow at responding to issues. Review collected by and hosted on G2.com.

Verified User in Oil & Energy
AO
Verified User in Oil & Energy
Mid-Market (51-1000 emp.)
"Moved to Mimecast and couldn't be happier!"
5/5
What do you like best about Mimecast Advanced Email Security?

Mimecast works well, and their AI system of learning normal communications is a huge help in detecting unusual activity. We were with a different product before and it was always giving us grief. As soon as we went to Mimecast all our problems went away immediately. Good admin consoles for fast in and out changes. Review collected by and hosted on G2.com.

What do you dislike about Mimecast Advanced Email Security?

Finding some items in the Admin Console is a little disjointed. I am jumping around to different areas for basic admin tasks. Review collected by and hosted on G2.com.