According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Rackspace Email is the mailbox provider for 2,206 domains — 0.33% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
Rackspace Email is a hosted email platform operated by Rackspace, the managed cloud services provider. It provides mailbox hosting and email infrastructure for small-to-medium organisations that prefer managed solutions rather than running their own mail servers.
Rackspace Email's deployment footprint skews toward the long tail of smaller independent websites rather than major global brands, with notable concentration in the .com space and US-influenced regions. It frequently appears as an MX provider alongside services like Elastic Email. For email senders, this means Rackspace-hosted mail represents a discrete but meaningful segment of the broader web, particularly for those reaching niche verticals or independent businesses, and warrants inclusion in comprehensive authentication and deliverability testing strategies.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 2 | 0.1% |
| Top 10,000 | 12 | 0.5% |
| Top 100,000 | 174 | 7.9% |
| Top 1,000,000 | 1,715 | 77.7% |
| Unranked | 303 | 13.7% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,564 | 70.9% | |
| .net | 118 | 5.3% | |
| .org | 105 | 4.8% | |
| .co.uk | 68 | 3.1% | |
| .ca | 24 | 1.1% | |
| .in | 19 | 0.9% | |
| .com.au | 16 | 0.7% | |
| .com.br | 16 | 0.7% | |
| .mx | 15 | 0.7% | |
| .de | 13 | 0.6% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,206 domains.
| Type | Service | Domains | Share of Rackspace Email users |
|---|---|---|---|
| ESP | Elastic Email | 221 | 10.0% |
| ESP | Mailgun | 184 | 8.3% |
| ESP | SendGrid (Twilio) | 161 | 7.3% |
| ESP | Amazon SES | 124 | 5.6% |
| ESP | Mandrill | 101 | 4.6% |
| ESP | Mailchimp | 83 | 3.8% |
| ESP | Zendesk | 55 | 2.5% |
| ESP | Freshdesk | 46 | 2.1% |
| ESP | MailerSend | 45 | 2.0% |
| ESP | Brevo (ex-Sendinblue) | 35 | 1.6% |
Because Rackspace Email consolidates mail from many unrelated independent domains on shared infrastructure, individual sender reputation is entangled with that of the broader customer base. A poorly-behaving sender on the platform can influence filtering decisions for legitimate senders sharing the same IP space or infrastructure. Deliverability teams should account for this when monitoring bounce rates, complaint feedback, and authentication compliance for mail reaching Rackspace-hosted recipients.
See the full Rackspace Email data page (KPI cards, trend, sample domains) →
Yes, especially if your recipient list includes smaller independent businesses, regional organisations, or niche verticals. Rackspace Email's footprint among the long tail of mid-sized sites makes it a relevant provider to include in authentication testing and cross-platform deliverability audits.
2,206 domains in the Tranco top-1M use Rackspace Email as their mailbox provider as of July 13, 2026 (0.33% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Rackspace Email accounts for 0.33% of domains with MX records in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Rackspace Email has been stable — its share moved -0.01 pp over the last 30 days (as of July 13, 2026).
Rackspace Email's largest TLD is .com (70.9% of its domains); it appears across 114 TLDs in total.