Mimecast

#4 in Secure Email Gateway

London

Products on G2

554

Total reviews

4.3

Avg. star rating

Mimecast Advanced Email Security ranks #4 in Secure Email Gateway.
Reviews across Mimecast's portfolio grew 1150.0% quarter-over-quarter.
Mimecast's 6 products span 10 categories on G2.
Mid-Market is the largest segment among reviewers, at 56.8%.

Traffic & LLM citations

Monthly G2.com page views and citations by AI answer engines, summed across Mimecast's products.

Page views and citations · Mimecast

Source: G2 review data

Winning from

Based on reviewers who said they switched from another vendor's product.

Proofpoint

Broadcom

Microsoft

Barracuda

Trellix

Losing to

Based on reviewers of other products who said they switched from Mimecast.

KnowBe4, Inc.

11 switched

MetaCompliance

9 switched

Abnormal AI

9 switched

Check Point Software Technologies

8 switched

PowerDMARC

8 switched

Key stats

+1150.0%

Mid-Market

2003

2,388

London

$378.7K

Adoption by company size

Segment	Share of reviews
Small Business	21.8%
Mid-Market	56.8%
Enterprise	21.4%

Quarterly history

Quarter	Total reviews	Avg. rating
2024 Q4	6	4.7
2025 Q1	12	4.1
2025 Q2	8	4.5
2025 Q3	4	4.6
2025 Q4	6	4.1
2026 Q1	5	4.2
2026 Q2	6	4.6
2026 Q3	75	4.1

About Mimecast

Mimecast secures human risk by empowering organizations to protect the human layer. As the leading cybersecurity company transforming the way businesses manage and secure human risk, Mimecast's AI-powered, API-enabled connected human risk platform protects organizations from the spectrum of cyber threats, empowering businesses to secure their collaborative environments, safeguard their critical data and actively engage employees in reducing risk and enhancing productivity.