This product overview synthesizes 54 recent reviews of Mimecast Advanced Email Security, focusing on overall satisfaction, competitive alternatives, and integrations with other software. Mimecast Advanced Email Security is primarily praised for its robust security features against email-borne threats. A significant portion of users, 24%, specifically highlight its impersonation protection capabilities, while 22% value its URL/link protection. Attachment protection is also a frequently cited benefit, noted by 20% of reviewers. The platform also provides effective spam and phishing protection, mentioned by 19% and 17% of reviewers respectively. Beyond security, 13% of users appreciate the reporting and analytics features, finding value in the detailed tracking and dashboards. Ease of use is another strength, with 11% noting the user-friendly interface and easy integration with other services. While Mimecast integrates with commonly used software like Microsoft 365 (mentioned by 19% of reviewers), alternatives like Proofpoint Email Protection are frequently evaluated alongside it (15% of reviewers). Other competing products mentioned include Microsoft Defender for Office 365, Barracuda Email Security Gateway, and Abnormal Security. The reviews suggest that while Mimecast offers a comprehensive suite of email security features, buyers should carefully evaluate it against alternatives to ensure the best fit for their specific needs.

Pros

Strong impersonation protection (24% of reviewers)
Effective URL/link protection (22% of reviewers)
Robust attachment protection (20% of reviewers)
Valuable reporting and analytics features (13% of reviewers)
User-friendly interface and easy integration (11% of reviewers)

Cons

Several alternatives are frequently evaluated, suggesting potential gaps or areas for improvement compared to competitors like Proofpoint (15% of reviewers)
Integration with Microsoft 365, while present (19% of reviewers), might require further consideration based on specific environment needs

What other products like Mimecast Advanced Email Security have you used or evaluated?

From 54 reviews | Last Published April 23, 2026

Summary

In a review set of 54 recent evaluations, several alternative and competitive products were mentioned alongside Mimecast Advanced Email Security. Proofpoint Email Protection is the most frequently cited alternative, with 15% of reviewers (8 of 54) mentioning it. Several other solutions are mentioned by approximately 7% of reviewers, including Microsoft Defender for Office 365, Barracuda Email Security Gateway, and Abnormal Security. Proofpoint Advanced Threat Protection, Microsoft 365, and Darktrace are each mentioned by 6% of the reviews (3 of 54). Less frequently, reviewers mention Mimecast DMARC Analyzer, Microsoft Exchange, and Microsoft Defender for Business, each noted by approximately 4% of reviewers (2 of 54). The mentions suggest that reviewers often evaluate Mimecast against a range of other security solutions, both from major vendors and more specialized providers.

Mimecast Advanced Email Security Reviews

94 Reviews

Great all rounded email security solution

Rating: 10 out of 10

Incentivized

April 30, 2025

Use Cases and Deployment Scope

We use Mimecast as our primary email gateway for all incoming and outgoing traffic for the organization. The core features that we primarily use is the strong anti spam filtering, DKIM signing of all outgoing traffic, automatic addition of warning banner for external senders on the incoming emails, attachments and URL and QR protections, as well as impersonation protection.

Pros

Great anti spam filter
Lots of rules customizations, allowing tailing the solution to your needs
URL re-write
Attachements sandboxing

Cons

Overlapping policies for attachments protection
Custom reports with a report builder
NDR flood protection

Likelihood to Recommend

Mimecast is a great solution for someone who needs to protect enterprise email communication with with minimum effort. The solution can be deployed in production within a matter of hours. Also it offers great integration for O365, but works well with custom mail infrastructures as well. I cannot think of a scenario where the solution wouldn't be applicable.

Verified User

Engineer in Information Technology (1001-5000 employees)

Vetted Review

1 year of experience

Mimecast Advanced Email Security Is The Cadillac Of Email Security

Rating: 10 out of 10

Incentivized

April 11, 2025

Use Cases and Deployment Scope

We previously used other email solutions but we had problems with false positives or not catching bad emails properly. We had to keep maintaining block lists, allow lists and other manual tasks. We went with Mimecast Advanced Email Security because of its AI-Powered net of who communicates with who looking for abnormal communications. It works extremely well and once Mimecast Advanced Email Security is up and running you do not need to babysit it all the time... it runs in the background doing a fantastic job. We have 500+ employees with native integration into Google. With the Gateway on the front end and the API's into Google for backend scanning and remediation... it covers you from all angles.

Pros

Grey/Junk Mail Identification
Flagging abnormal communications
Impersonation Protection
KnowBe4 Integration
Highly Customizable Rules Including Bypasses for Special Cases

Cons

Admin Console makes you jump around. Would be nice to have things grouped into a "Daily Operations" menu for your most common tasks.

Likelihood to Recommend

Mimecast Advanced Email Security has been great and looking at emails that come from new domains, known malicious sites as well as prompting employees randomly to verify a link when clicking on them. This will also do a last minute check of the URL to confirm if it is a known threat. The Google Integration is much better than other solutions we have looked at.

Verified User

Administrator in Information Technology (501-1000 employees)

Vetted Review

5 years of experience

Mimecast Review.

Rating: 8 out of 10

Incentivized

April 9, 2025

Use Cases and Deployment Scope

We use it for email scanning and filtering. It blocks a large number of phishing and spam emails and warns our users.

Pros

Blocks spam.
Blocks Phishing.
We manage the whitelist.
We have built rules such as impersonation protection.

Cons

Better tech support.
More use of AI/ Machine learning in understanding user behavior.
More availability search options in message tracking such as words in body of email.
Less false positives.
Option of longer retention of data (more than 30 days).
Easier management.

Likelihood to Recommend

It is well suited for larger environments, less so for smaller companies.

Verified User

C-Level Executive in Information Technology (51-200 employees)

Vetted Review

7 years of experience

Great solution to regain control of your e-mail

Rating: 9 out of 10

Incentivized

April 8, 2025

Use Cases and Deployment Scope

After initially depending on O365 filters only we were consistently flooded with Spam and Phishing attacks regardless of how hard our security admin worked to respond. Through the use of Mimecast Advanced Email Security this has fallen to next to zero. Additionally, by tracing failed messages we were able to find misconfigurations in our environment which had been affecting our client service.

Pros

Detection and blocking of dangerous content
Prescanning of links in e-mail
Enhanced ability to maintain block and permit lists
Detailed tracking of messages and event

Cons

The user interface is not always as intuitive as I would like
Client Service is slow to respond even to P1 requests

Likelihood to Recommend

1 - Organizations that have a large sales force that is not security aware
2 - Finance Departments with Jr Staff that may respond to a Phishing attack
3 - People who are inundated with e-mail from lists they never joined

Jim Barry

Sr Manager IT Infrastructure in Information Technology at restor3d (201-500 employees)

Vetted Review

9 years of experience

View profile

Great product to improve email security

Rating: 10 out of 10

Incentivized

April 8, 2025

Use Cases and Deployment Scope

[...] are an information management company and we deal with data of all classifications every day, we need to ensure we take the utmost care with data and Mimecast Advanced Email Security helps us to combat Cyber threats and ensure our data and customer data is safe.

Pros

Filters spam
Combats threats
Provides detailed analytics
Providers awareness training for our Staff

Cons

The dashboard and over GUI could do with some improvements
The way that multiple accounts are configured each with differing access can be confusing
The outlook plugin authentication does not always work well

Likelihood to Recommend

It has some great benefits both operationally and from a user training perspective. We live in a word where security is paramount and Mimecast Advanced Email Security allows us to ensure that we are taking the right steps. Overall Mimecast Advanced Email Security add to our suite of security products and protocols and allows us to be protected and compliant.

Karl Joseph

Head of Programme Management in Professional Services at Restore Plc (1001-5000 employees)

Vetted Review

4 years of experience

Mimecast Advanced Email Security

Rating: 8 out of 10

Incentivized

April 8, 2025

Use Cases and Deployment Scope

We use Mimecast Advanced Email Security primarily for the email firewall. As an organisation with 2000+ users, we receive a lot of email spam. Mimecast Advanced Email Security acts as an extra layer of security between bad actors and stakeholders, stopping spam before it gets to them.

Pros

Impersonation Protect
Custom policies and customisation
Spam prevention

Cons

UI and ease of use
Training
Explanation for the end user

Likelihood to Recommend

If a user got an email from a compromised user, we could block that specific email in our Mimecast Advanced Email Security ‘blocked senders’ list.

Verified User

Technician in Information Technology (201-500 employees)

Vetted Review

5 years of experience

Mimecast Email Security Gateway

Rating: 3 out of 10

Incentivized

April 8, 2025

Use Cases and Deployment Scope

We use Mimecast Advanced Email Security for email spam and malware filtering, as well as for email encryption for emails containing sensitive information. As a bank, it is imperative that we protect our customer information and prevent phishing emails from reaching our staff.

Pros

Automatically encrypting outgoing emails containing sensitive information
Preventing specific attachment types from being delivered
Delivering a digest of quarantined spam emails to users at specific intervals

Cons

Preventing spam from reaching users
Preventing phishing emails from reaching users
Using behavioral-based algorithms to prevent malicious emails
Customer service for support tickets; truly caring that an issue is resolved
Confusing policy configurations

Likelihood to Recommend

Mimecast Advanced Email Security is easy for general staff to use to encrypt email, and the experience for external recipients is better than for other email systems. However, in my opinion, Mimecast Advanced Email Security has not kept pace with other email security platforms in preventing newer types of email phishing attacks, and where it once shone in customer service for us, that metric has fallen short in the last 3 years. In my opinion, Mimecast Advanced Email Security seems to be trying to turn things around, but currently I cannot recommend them as a complete email security gateway.

Verified User

Director in Information Technology (501-1000 employees)

Vetted Review

4 years of experience

Mimecast Advanced Email Security

Rating: 8 out of 10

Incentivized

April 2, 2025

Use Cases and Deployment Scope

We use Mimecast Advanced Email Security to provide a external messaging hygiene filtering service before email hits O365 and This provides us with far greater visibility and control over our mailflow than relying on Microsoft's inbuilt filtering options. The message tracing, Greylisting, phish reporting options, and end user's personal portals are all excellent in Mimecast Advanced Email Security and are well liked by administrators, support staff and end users

Pros

Greylisting
Mail tracing
End User reporting options

Cons

Reporting generally is a bit on the basic side
The web admin portal as a bit idiosincratic
The requirement to contact support for auth'd SMTP setup is a pain

Likelihood to Recommend

As a well respected filtering service Mimecast Advanced Email Security is generally very good, it can take a bit of bedding in. Reporting is basic so if you want in-depth customized reports it isn't ideal, but if you want a very robust filter with some very nice options it is excellent.

Verified User

Administrator in Information Technology (1001-5000 employees)

Vetted Review

2 years of experience

Difficulties with Mimecast Advanced Email Security

Rating: 6 out of 10

Incentivized

April 2, 2025

Use Cases and Deployment Scope

We use Mimecast Advanced Email Security for all email security. We have had to set up a number of different policies to allow email flow into our organization. The process for this is very cumbersome and takes way to long to complete. In our experience, almost every time support needs to be called for help. It is not very user friendly. Should be way easier to set up different policies.

Pros

Block Spam
impersonation protection
attachment protection

Cons

Create Policies

Likelihood to Recommend

Mimecast Advanced Email Security is a powerful tool for organizations facing complex and high-volume email threats, but it may not be necessary for smaller businesses or those with simpler security needs. If you have any specific requirements or concerns, Mimecast Advanced Email Security then would be one of the best solutions on the market.

Aaron Doyle

IT Manager in Information Technology at Brad Hall Companies (1001-5000 employees)

Vetted Review

2 years of experience

4 Out of 10

Rating: 3 out of 10

Incentivized

April 2, 2025

Use Cases and Deployment Scope

We use Mimecast Advanced Email Security to filter through all incoming and outgoing emails within our corporate Enterprise. This is an essential tool for any organization. However, Mimecast Advanced Email Security is not great. The web portal is EXTREMELY unintuitive and difficult to navigate. The different folders and pages are not well named or laid out. The filters are inconsistent and we are constantly having to add more policies to change filtering rules. There has been nothing we can do to avoid having to spend tons of time daily looking through Mimecast Advanced Email Security blocked emails. Also, our Mimecast Advanced Email Security support concierge or helpdesk team have been extremely unhelpful. either they tell us our settings look good and nothing needs changed or they just completely ignore our emails and ghost us. They refuse to take responsibility when there are issues with the product. As soon as our contract ends we are going with Checkpoint IMMEDIATELY. After having so many issues we have done extensive research and we know Mimecast Advanced Email Security is not the way to go. I know several other IT professionals who have similar grievances with Mimecast Advanced Email Security.

Pros

Blocks emails
Warns that emails originate outside the organization

Cons

web portal sucks to navigate
inconsistent filtering
support is very unhelpful and unfamiliar with the product.

Likelihood to Recommend

Better than nothing but does a poor job.

Casey Aiken

Network Security Administrator in Information Technology at Brad Hall Companies (1001-5000 employees)

Vetted Review

1 year of experience

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