Name: Mimecast Advanced Email Security
Rating: 4.5 (623 reviews)

Overview

Product Information on Mimecast Advanced Email Security

Updated 10th March 2026

What is Mimecast Advanced Email Security?

Email Security, Cloud Integrated (CI) protects organizations against all forms of email-based attacks, from phishing and credential theft to ransomware and zero-day threats. This solution deploys behind M365 to collect emails after they have passed through Microsoft security, reinspect them, and take action as needed. With a setup time of just four minutes and out-of-the-box settings designed to optimize security immediately, Email Security CI delivers best-in-class efficacy in the simplest way possible. Customers get the full power of Mimecast’s AI-powered detection and threat intelligence in a solution built for the reality of navigating today’s hostile threat landscape with limited time and resources. Email Security CI also offers a fully integrated Awareness Training solution to help organizations easily and effectively reduce the risk of human error.

Overall experience with Mimecast Advanced Email Security

Manager, It Security And Risk Management

250M - 500M USD, Healthcare and Biotech

FAVORABLE

“DMARC Analyzer And SPF Delegation Strengthen Organisational Email And Governance Controls”

5.0

Mar 5, 2026

Mimecast provides an industry standard email security solution, and this solution allows us to comply with relevant security standards. The solution also ensures that emails that enter users’ inboxes are protected and secure while having all the relevant analysis and risk assessment, allowing us to have sufficient controls on emails.

IT Associate

Gov't/PS/ED 5,000 - 50,000 Employees, Education

CRITICAL

“Helpful onboarding and support, but limited against modern threats. Platform feels dated”

3.0

Mar 12, 2026

Great onboarding experience & strong support for on-prem exchange. However, the admin interface is not intuitive and has a steep learning curve. The gateway-based approach also feels dated compared to newer solutions.

About Company

Company Description

Since 2003, Mimecast has stopped bad things from happening to good organizations by enabling them to work protected. We empower over 40,000 customers to mitigate risk and manage complexities across a threat landscape driven by malicious cyberattacks, human error, and technology fallibility. Our advanced solutions provide proactive threat detection, brand protection, awareness training, and data retention capabilities evolving workplaces need today. Mimecast transforms email and collaboration security into the eyes and ears of organizations worldwide.

Company Details

Company type

Private

Year Founded

2003

Head office location

Broadgate, United Kingdom

Number of employees

1001 - 5000

Website

https://www.mimecast.com/

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Key Insights

A Snapshot of What Matters - Based on Validated User Reviews

User Sentiment About Mimecast Advanced Email Security

Reviewer Insights for: Mimecast Advanced Email Security

Deciding Factors: Mimecast Advanced Email Security Vs. Market Average

Performance of Mimecast Advanced Email Security Across Market Features

Mimecast Advanced Email Security Likes & Dislikes

The product provides real-time protection against malicious spam emails and phishing. It applies relevant threat detection and significantly reduces the likelihood of operational disruption due to email related cyber threats. The DMARC Analyzer and SPF delegation protect the organisation email and brand, and allows us to meet security standards while having control over our email services. This service also ensures strict compliance with governance and assurance requirements while ensuring we have improved resilience and protecting the organisation as a whole.

The onboarding process was strong, and the customer success and support teams were helpful throughout implementation.

It's very easy to use and manage. You can add email domains to be trusted and whitelisted so that trusted emails can get through. It can also block credit card numbers from being sent and received, which is especially helpful in a financial environment.

Nothing that I dislike about the product.

The platform does not seem to have kept pace with newer threats, especially AI-driven attacks. The gateway approach was effective in the past, but it now feels less capable on its own. It can also feel like customers are expected to purchase additional products or move to other offerings to address gaps in protection.

The software is great, though sometimes the web filters work a little too well and will block legitimate emails. Luckily these can be released easily from the admin portal so it's not a major issue overall.

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Peer Discussions

Mimecast Advanced Email Security Reviews and Ratings

4.5

(623 Ratings)

Rating Distribution

5 Star: 54%
4 Star: 38%
3 Star: 7%
2 Star: 1%
1 Star: 0%

Customer Experience

Evaluation & Contracting

4.5

Integration & Deployment

4.4

Service & Support

4.4

Product Capabilities

4.6

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Manager, It Security And Risk Management
50M-1B USD
Healthcare and Biotech
Review Source
DMARC Analyzer And SPF Delegation Strengthen Organisational Email And Governance Controls
5.0
Mar 5, 2026
Mimecast provides an industry standard email security solution, and this solution allows us to comply with relevant security standards. The solution also ensures that emails that enter users’ inboxes are protected and secure while having all the relevant analysis and risk assessment, allowing us to have sufficient controls on emails.
It Associate
<50M USD
Banking
Review Source
Mimecast Provides Strong Network Protection, And Works Great
4.0
Jan 23, 2026
We use Mimecast to protect our environment from potential email attacks, but it also works great when it comes to stopping spam emails getting into our network. It adds a very strong layer of protection to our overall network.We also use it to check website links sent via email as it can tell us if there's any risks behind opening the link.
Manager, IT Security and Risk Management
Gov't/PS/Ed
Education
Review Source
Policy Overlaps and Synchronization Hiccups Noted in Mimecast Office 365 Integration
4.0
Mar 9, 2026
Mimecast has been wonderful with providing excellent email security coverage and the amount of customizations, policies, groups/profiles, and ways to tailor your entire environment almost feel endless. It has definitely been a work in progress with a bit of a learning curve, but overall we are happy in the direction things are going with Mimecast.
SYSTEM ADMINISTRATOR
50M-1B USD
IT Services
Review Source
Mimecast Offers Strong Configuration and Security Features for Organization Needs
5.0
Oct 31, 2025
Mimecast has been very helpful to our organization with its constantly improving algorithms and robust configuration options. Once you understand how the policies work and are applied, configuring the product to meet your needs becomes second nature. The support team is amazing as well any time we need a second set of eyes on our configuration.
IT Associate
Gov't/PS/Ed
Education
Review Source
Helpful onboarding and support, but limited against modern threats. Platform feels dated
3.0
Mar 12, 2026
Great onboarding experience & strong support for on-prem exchange. However, the admin interface is not intuitive and has a steep learning curve. The gateway-based approach also feels dated compared to newer solutions.

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