Companies Using Mimecast

Mimecast is used by 69,108 companies worldwide, including TP group, HP, Genpact Ltd., based on our analysis of 29.6M crawled domains at TechnologyChecker.io. It's particularly popular in the Financial Services industry (6.1% of customers).

Mimecast has 69,108 active customers detected through our full-sweep crawl of 29.9M live business domains. We enriched 57,923 of these with LinkedIn company data on TechnologyChecker.io to generate detailed insights. An additional 1,437 sites that previously used Mimecast are also tracked.

Mimecast holds 9.62% of the Email Security market, ranking #3 in the category — based on our analysis of 29.6M domains and 40K+ technologies at TechnologyChecker.io.

The top alternatives to Mimecast include Microsoft Defender (37.3% market share), Jellyfish (13.5% market share), MailChannels (9.17% market share), Barracuda (8.96% market share) — based on our market share data across 29.6M crawled domains.

United States leads with 29,182 Mimecast customers, followed by United Kingdom (14,675), Australia (3,340), Canada (1,489), Germany (1,201), based on our enriched company data at TechnologyChecker.io.

The most common company size is 1-10 employees, representing 25.53% of Mimecast customers, based on our analysis of 57,923 enriched companies. This is followed by 11-50 employees (28.84%) and 51-200 employees (23%).

The majority of Mimecast customers were founded in the 2000s (18.75%), followed by the 2010s (18.68%), based on our analysis of 57,923 enriched companies. This suggests Mimecast is most popular among established companies.

The ideal Mimecast customer is: Company Size: 11-200 employees, Location: US, UK, Australia, Industry: Finance, insurance, legal, Founded: Pre-2010, Detection: MX record — based on our analysis of 57,923 enriched companies at TechnologyChecker.io.

Our crawl detects Mimecast mail records on 69,108 domains as of August 2026, and we matched 57,923 of them to company records. That 83.8% match rate is the highest of any technology profile on this site, because detection reads DNS rather than page markup and the buyer is almost always a real registered business.

Larger and more regulated than most technology we profile. Only 25.53% of domains belong to companies with ten staff or fewer, against 28.84% at 11 to 50 and 23% at 51 to 200. Financial services leads the industry mix on 6.1%, followed by construction 4.89%, insurance 4.6% and law practice 4.39%.

Mimecast was founded in London in 2003, and the home-market concentration has outlasted both a US listing and two decades of international expansion. The United Kingdom accounts for 25.74% of enriched Mimecast domains, several times its share in nearly any other technology we track. The United States still leads overall on 51.19%.

That is the main flow we observe. We watched 940 domains drop Mimecast and route mail directly to Microsoft 365, against 502 moving the other way. Because Microsoft Defender is bundled into licences these organisations already hold, the decision is usually about consolidating spend rather than about filtering quality. Because a domain publishes one set of mail records, these are genuine replacements rather than additions.

Mimecast is larger than both, at 9.62% of the category against Barracuda on 8.96% and Proofpoint on 7.37%. The switching data splits though: Proofpoint took 126 domains from Mimecast and returned 17, while Mimecast gained 65 from Barracuda and lost 23 back, so it wins that second exchange comfortably. Both exchanges are small against a base of 69,108 active domains.

We read each domain's MX records and match them against Mimecast's mail servers. That makes the detection a published DNS fact rather than an inference from page content, so it cannot be blocked by a consent banner or missed because a page failed to render, and it works on domains that serve no website.

Because the two are mutually exclusive in our detection by design. A mail security gateway works by receiving mail first, so a domain protected by Mimecast points its MX record at Mimecast rather than at Microsoft. Only 3.24% of Mimecast domains show Microsoft 365 records, and those are usually secondary or transitional configurations.

HP, CVS Health, Sanofi, Carrefour, Schneider Electric, Genpact, Flipkart, Ambev and Emirates all route mail for at least one domain through Mimecast. Detection works per domain and large groups operate many, so a listing shows that domain's inbound mail passes through Mimecast rather than group-wide standardisation on it. The list skews toward finance, pharmaceuticals, retail and aviation, which are all sectors where email compliance carries statutory weight.

Steadily rather than sharply, which fits enterprise software sold by a sales team. Our long-run feed records 4,196 domains in January 2016, 13,627 by January 2019, 27,090 by January 2022 and 40,874 by April 2025. The current live crawl puts it at 69,108, though that figure comes from a different measurement system.

Notably old. 16.85% of enriched Mimecast customers were founded before 1960, a share matched by almost nothing else in our index, with a further 18.75% founded in the 2000s. Established, document-heavy organisations in regulated sectors are the core of this base and are the least likely to replace a working gateway.

We have observed 1,437 domains remove Mimecast mail records since our crawler began covering the technology in April 2026. Of those, 940 now point mail directly at Microsoft 365 and 126 moved to Proofpoint. Against 69,108 active domains, that is churn watched over a few months rather than a lifetime total.

Yes, and that is the normal deployment. Mimecast sits in front of a Microsoft mailbox, filtering and archiving mail before delivery, so the customer keeps Microsoft for mailboxes while Mimecast handles security. Our detection sees only the MX record, which points at the gateway, so the underlying mailbox platform stays invisible to us.

Yes. This page ranks the largest by audience size, and TechnologyChecker.io holds the full set of 69,108 detected domains with company data attached to 57,923 of them. Those enriched rows carry industry, headcount band, country and founding year, which makes this one of the cleanest technographic segments we publish. Because detection reads DNS, the list also covers domains that serve no public website at all.