According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), MailHostBox is the email service provider (ESP) for 752 domains — 0.12% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
MailHostBox is an email service provider that operates delegated sending infrastructure via SPF authentication, enabling smaller and independent organisations to dispatch mail under their own domain names. Its deployment is concentrated within the .com namespace, with customer presence skewed towards North American and global mid-market senders rather than the largest global enterprises.
For email deliverability professionals, MailHostBox's long-tail footprint means it surfaces infrequently in representative high-volume recipient datasets, yet remains sufficiently widespread that mail authentication and reputation audits should account for its mechanisms. Encountering MailHostBox in an inbound SPF chain typically signals a smaller-scale, self-directed sender configuration—a pattern worth recognising during policy evaluation and filtering decisions.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 3 | 0.4% |
| Top 100,000 | 48 | 6.4% |
| Top 1,000,000 | 572 | 76.1% |
| Unranked | 129 | 17.2% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 381 | 50.7% | |
| .in | 140 | 18.6% | |
| .net | 63 | 8.4% | |
| .org | 29 | 3.9% | |
| .co.in | 27 | 3.6% | |
| .co | 17 | 2.3% | |
| .mn | 9 | 1.2% | |
| .info | 6 | 0.8% | |
| .me | 5 | 0.7% | |
| .biz | 4 | 0.5% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 752 domains.
| Type | Service | Domains | Share of MailHostBox users |
|---|---|---|---|
| Mailbox | MailHostBox | 496 | 66.0% |
| Mailbox | Google Workspace | 144 | 19.1% |
| Mailbox | Self-Hosted | 37 | 4.9% |
| Mailbox | Microsoft 365 | 15 | 2.0% |
| Mailbox | Zoho Mail | 9 | 1.2% |
| Mailbox | Unknown / Other | 8 | 1.1% |
| ESP | Amazon SES | 10 | 1.3% |
| ESP | LogicBoxes OrderBox | 8 | 1.1% |
| ESP | Mandrill | 8 | 1.1% |
| ESP | SendGrid (Twilio) | 8 | 1.1% |
MailHostBox appears predominantly in SPF records from smaller websites, making recognition of its mechanisms important for organisations performing email authentication audits and configuring reputation-based filters. Because its footprint is concentrated in the long tail rather than among the largest brands, mail delegated through MailHostBox typically represents independent or boutique senders rather than enterprise mass mail—a distinction that can inform filtering policy calibration and sender-reputation thresholds.
See the full MailHostBox data page (KPI cards, trend, sample domains) →
MailHostBox is a delegated sending provider used by smaller organisations; recognising it in SPF records and filtering policies is important for accurate authentication validation and avoiding false-positive rejection of legitimate mail from independent senders.
752 domains in the Tranco top-1M use MailHostBox as their email service provider (ESP) as of July 13, 2026 (0.12% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
MailHostBox accounts for 0.12% of SPF-publishing domains 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.
MailHostBox's largest TLD is .com (50.7% of its domains); it appears across 62 TLDs in total.