esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 26, 2026), Mimecast is the email service provider (ESP) for 8,963 domains — 1.42% of 630,738 SPF-publishing domains. Over the last 30 days its share declined by 0.03 pp. Its strongest TLD is .com (58.8% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-07-26 DNS snapshot.
UK-origin enterprise email security gateway (Permira-owned).
Directory category: Gateway. The classification comes from include: mechanisms in the SPF record. It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
Across 176 distinct TLDs its top three are .com (58.8%), .org (8.6%), .co.uk (6.1%) — together 73.4% of the 8,963 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 (Mailbox, 7,424 domains, 82.8% of them), followed by Microsoft 365 (9.3%). Its share of SPF-publishing domains moved -0.03 pp in 30 days — inside the daily noise of list rotation. Directly comparable by the same detection rule: Amazon SES, SendGrid (Twilio), Mailgun. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-07-26); a domain appears here when its published records match the include: mechanisms in the SPF record rule, which is an infrastructure fact, not a commercial relationship.
What else the same 8,963 domains use — cross-tabulated from the same daily snapshot (2026-07-26).
| Type | Service | Domains | Share of Mimecast users |
|---|---|---|---|
| Mailbox | Mimecast | 7,424 | 82.8% |
| Mailbox | Microsoft 365 | 835 | 9.3% |
| Mailbox | Proofpoint | 188 | 2.1% |
| Mailbox | Google Workspace | 174 | 1.9% |
| Mailbox | Unknown / Other | 59 | 0.7% |
| Mailbox | Self-Hosted | 34 | 0.4% |
| ESP | Salesforce | 1,334 | 14.9% |
| ESP | SendGrid (Twilio) | 1,173 | 13.1% |
| ESP | Amazon SES | 1,130 | 12.6% |
| ESP | HubSpot | 931 | 10.4% |
8,963 domains in the Tranco top-1M use Mimecast as their email service provider (ESP) as of July 26, 2026, according to Live Direct Marketing's daily DNS scan.
Mimecast holds 1.42% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-26). The number is recomputed every day.
Mimecast's share declined by 0.03 percentage points over the last 30 days (as of July 26, 2026).
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-07-26).
Amazon SES (6.17%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.83%) · Mailchimp (3.70%) · Mandrill (3.36%) · HubSpot (3.19%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.82%)
Showing 100 of 8,963 domains.