mailbox
According to Live Direct Marketing's daily Tranco top-1M scan (July 26, 2026), Rackspace Email is the mailbox provider for 2,273 domains — 0.34% of 667,887 domains with MX records. Its share has been stable over the last 30 days. Its strongest TLD is .com (71.8% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-07-26 DNS snapshot.
Rackspace brand mailbox (emailsrvr.com).
Directory category: Mailbox. 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.
Across 113 distinct TLDs its top three are .com (71.8%), .net (5.1%), .org (4.8%) — together 81.7% of the 2,273 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 Elastic Email (ESP, 230 domains, 10.1% of them), followed by Mailgun (8.3%). Its share of domains with MX records has not moved measurably in 30 days. 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 (2026-07-26); 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.
What else the same 2,273 domains use — cross-tabulated from the same daily snapshot (2026-07-26).
| Type | Service | Domains | Share of Rackspace Email users |
|---|---|---|---|
| ESP | Elastic Email | 230 | 10.1% |
| ESP | Mailgun | 189 | 8.3% |
| ESP | SendGrid (Twilio) | 157 | 6.9% |
| ESP | Amazon SES | 131 | 5.8% |
| ESP | Mandrill | 99 | 4.4% |
| ESP | Mailchimp | 83 | 3.7% |
| ESP | Zendesk | 55 | 2.4% |
| ESP | MailerSend | 49 | 2.2% |
| ESP | Freshdesk | 47 | 2.1% |
| ESP | Brevo (ex-Sendinblue) | 36 | 1.6% |
2,273 domains in the Tranco top-1M use Rackspace Email as their mailbox provider as of July 26, 2026, according to Live Direct Marketing's daily DNS scan.
Rackspace Email holds 0.34% of domains with MX records in the Tranco top-1M (snapshot of 2026-07-26). The number is recomputed every day.
Rackspace Email's share has been stable over the last 30 days (±0.01 pp).
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 2026-07-26).
Self-Hosted (22.75%) · Google Workspace (21.84%) · Microsoft 365 (16.92%) · Unknown / Other (6.80%) · Generic / unmatched (mx*.*) (2.54%) · Proofpoint (1.92%) · Generic / unmatched (mail.*) (1.77%) · Yandex 360 (1.68%) · Cloudflare Email Routing (1.63%) · Mimecast (1.53%)
Showing 100 of 2,273 domains.