According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Mailbox.org is the mailbox provider for 358 domains — 0.05% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
Mailbox.org is a privacy-focused email provider operated by Mailbox.org GmbH, a German company. It serves individual users and small organisations across Europe, positioning itself around data protection and user autonomy rather than enterprise-scale delivery.
In the Tranco top-1M footprint, Mailbox.org appears predominantly in the long tail of smaller web properties rather than among the world's largest brands, with pronounced concentration in German-speaking markets. For senders, this means Mailbox.org addresses are less common in mainstream bulk-mail lists but concentrated in European and privacy-conscious segments; for deliverability professionals, understanding Mailbox.org's authentication and filtering practices matters mainly when serving regional or European-focused audiences.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 5 | 1.4% |
| Top 100,000 | 45 | 12.6% |
| Top 1,000,000 | 247 | 69.0% |
| Unranked | 61 | 17.0% |
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 108 | 30.2% | |
| .com | 85 | 23.7% | |
| .net | 35 | 9.8% | |
| .org | 32 | 8.9% | |
| .eu | 11 | 3.1% | |
| .io | 7 | 2.0% | |
| .app | 7 | 2.0% | |
| .dev | 7 | 2.0% | |
| .com.br | 4 | 1.1% | |
| .info | 4 | 1.1% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 358 domains.
| Type | Service | Domains | Share of Mailbox.org users |
|---|---|---|---|
| ESP | Amazon SES | 21 | 5.9% |
| ESP | Constant Contact | 15 | 4.2% |
| ESP | Zendesk | 12 | 3.4% |
| ESP | Brevo (ex-Sendinblue) | 12 | 3.4% |
| ESP | Mailjet (Sinch) | 11 | 3.1% |
| ESP | Newsletter2Go (Brevo) | 6 | 1.7% |
| ESP | Mailchimp | 4 | 1.1% |
| ESP | Postmark | 3 | 0.8% |
| ESP | Scaleway TEM | 2 | 0.6% |
| ESP | MailerSend | 2 | 0.6% |
Because Mailbox.org sits primarily in smaller web properties and German-language markets rather than among the largest global websites, sender reputation at Mailbox.org should be monitored as a distinct regional signal rather than rolled into global metrics. Organisations serving European or German-speaking audiences can expect regular exposure to Mailbox.org subscribers and should include the provider in their regional deliverability assessments; those focused on global bulk delivery can deprioritise it without material impact on reach.
See the full Mailbox.org data page (KPI cards, trend, sample domains) →
If your audience spans Europe or German-speaking regions, Mailbox.org is worth including in your regional test matrix; otherwise, its presence in the long tail of smaller websites means it can be deprioritised in global deliverability testing.
358 domains in the Tranco top-1M use Mailbox.org as their mailbox provider as of July 13, 2026 (0.05% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Mailbox.org accounts for 0.05% 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.
Mailbox.org's largest TLD is .de (30.2% of its domains); it appears across 49 TLDs in total.