United Domains (DE) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), United Domains (DE) is the mailbox provider for 405 domains — 0.06% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 405 domains in the Tranco top-1M use United Domains (DE) (0.06% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .de (39.0% of its domains).
- Region skew: Germany.
- Most co-used service: Mailjet (Sinch).
- Directory category: hosting mail bundle.
Why United Domains (DE) appears in this category
German registrar bundling mailbox with domain.
We classify it as a hosting mail bundle from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
United Domains is a German domain registrar and web hosting provider that offers email hosting services to its customers. The company maintains a substantial presence in the European market, particularly in the .de space, and serves thousands of smaller and mid-market organisations across the continent.
In the email landscape, United Domains appears as a long-tail mailbox provider—common on smaller websites and regional businesses rather than global consumer or enterprise brands. The provider's presence clusters heavily around German-language sites and European TLDs, which means encountering mail from a United Domains address typically signals a regional or smaller-scale operation. For delivery professionals, this geographic concentration means United Domains operates its own mail infrastructure and authentication policies that may differ from globally distributed providers, so sender verification practices should remain consistent regardless of whether the recipient domain is hosted there.
Where United Domains (DE) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.2% |
| Top 100,000 | 17 | 4.2% |
| Top 1,000,000 | 382 | 94.3% |
| Unranked | 5 | 1.2% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 158 | 39.0% | |
| .com | 83 | 20.5% | |
| .net | 17 | 4.2% | |
| .org | 16 | 4.0% | |
| .eu | 11 | 2.7% | |
| .io | 9 | 2.2% | |
| .online | 8 | 2.0% | |
| .at | 7 | 1.7% | |
| .fr | 7 | 1.7% | |
| .it | 6 | 1.5% |
What United Domains (DE) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 405 domains.
| Type | Service | Domains | Share of United Domains (DE) users |
|---|---|---|---|
| ESP | Mailjet (Sinch) | 16 | 4.0% |
| ESP | Zendesk | 11 | 2.7% |
| ESP | Amazon SES | 9 | 2.2% |
| ESP | Brevo (ex-Sendinblue) | 9 | 2.2% |
| ESP | Mailchimp | 6 | 1.5% |
| ESP | Mailgun | 4 | 1.0% |
| ESP | SendGrid (Twilio) | 3 | 0.7% |
| ESP | Mandrill | 3 | 0.7% |
| ESP | HubSpot | 2 | 0.5% |
| ESP | Newsletter2Go (Brevo) | 2 | 0.5% |
Regional mailbox clustering and authentication expectations
United Domains' customer base clusters geographically around Germany and continental Europe, which shapes authentication and reputation expectations for inbound mail. Whilst the provider maintains reasonable technical standards, its regional footprint means that sender authentication enforcement—SPF, DKIM, and DMARC—can vary by customer segment and local policy. Senders targeting European or German audiences should verify compliance with these authentication standards when routing mail to United Domains addresses, applying the same rigour as with any dedicated provider, but remain aware that acceptance policies may reflect regional deliverability norms rather than global best practices.
See the full United Domains (DE) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email delivery to United Domains when running campaigns?
If your recipient list includes a meaningful proportion of German-language or European small-business users, testing at least one sample to a United Domains address is prudent; otherwise, it is not typically a priority testing tier unless your audience skews heavily toward regional European organisations.
How many domains use United Domains (DE)?
405 domains in the Tranco top-1M use United Domains (DE) as their mailbox provider as of September 12, 2026 (0.06% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is United Domains (DE) common enough to affect email deliverability testing?
United Domains (DE) accounts for 0.06% 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.
Which countries or TLDs use United Domains (DE) most?
United Domains (DE)'s largest TLD is .de (39.0% of its domains); it appears across 61 TLDs in total.