Mimecast email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Mimecast is the mailbox provider for 9,846 domains — 1.46% of 674,487 domains with MX records. Over the last 30 days its share declined by 0.03 pp. Its strongest TLD is .com (59.4% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-14 DNS snapshot.
What Mimecast represents in this dataset
UK/global cloud secure email gateway, very large enterprise share.
Directory category: Gateway. The classification comes from primary MX record (lowest preference). It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-14 snapshot shows about Mimecast
Across 181 distinct TLDs its top three are .com (59.4%), .org (8.2%), .co.uk (6.3%) — together 73.8% of the 9,846 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is Mimecast (ESP, 7,083 domains, 71.9% of them), followed by Salesforce (11.7%). Its share of domains with MX records moved -0.03 pp in 30 days — inside the daily noise of list rotation. Directly comparable by the same detection rule: Self-Hosted, Google Workspace, Microsoft 365. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-14); a domain appears here when its published records match the primary MX record (lowest preference) rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with Mimecast
What else the same 9,846 domains use — cross-tabulated from the same daily snapshot (2026-09-14).
| Type | Service | Domains | Share of Mimecast users |
|---|---|---|---|
| ESP | Mimecast | 7,083 | 71.9% |
| ESP | Salesforce | 1,149 | 11.7% |
| ESP | SendGrid (Twilio) | 1,011 | 10.3% |
| ESP | Amazon SES | 987 | 10.0% |
| ESP | HubSpot | 782 | 7.9% |
| ESP | Zendesk | 753 | 7.6% |
| ESP | Mailchimp | 659 | 6.7% |
| ESP | Mandrill | 631 | 6.4% |
| ESP | Mailgun | 521 | 5.3% |
| ESP | Marketo (Adobe) | 238 | 2.4% |
TLD distribution (top 30 of 181)
Frequently asked questions
How many domains use Mimecast?
9,846 domains in the Tranco top-1M use Mimecast as their mailbox provider as of September 14, 2026, according to Live Direct Marketing's daily DNS scan.
What is Mimecast's market share?
Mimecast holds 1.46% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-14). The number is recomputed every day.
Is Mimecast growing or declining?
Mimecast's share declined by 0.03 percentage points over the last 30 days (as of September 14, 2026).
What are the biggest alternatives to Mimecast?
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-09-14).
Largest mailbox providers in this category
Self-Hosted (22.46%) · Google Workspace (21.60%) · Microsoft 365 (16.95%) · Unknown / Other (6.60%) · Generic / unmatched (mx*.*) (2.54%) · Generic / unmatched (mail.*) (1.94%) · Proofpoint (1.86%) · Cloudflare Email Routing (1.76%) · Yandex 360 (1.62%) · Hostinger (1.26%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 9,846 domains.