According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), T-Online is the mailbox provider for 10 domains — 0.00% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
T-Online is the email and web hosting service operated by Deutsche Telekom, Germany's largest telecommunications provider. It serves as a primary mailbox platform for users across the German-speaking regions and is a foundational element of the German internet infrastructure.
T-Online's prevalence in the Tranco top-1M dataset skews heavily towards high-traffic, enterprise, and well-known sites concentrated in the .de namespace. For senders and organisations managing email to German recipients or hosting on German infrastructure, T-Online's filtering and acceptance policies represent a critical touchpoint; its prominence means that deliverability failures to T-Online will likely affect a significant portion of any German-focused mail stream.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 10.0% |
| Top 10,000 | 1 | 10.0% |
| Top 100,000 | 1 | 10.0% |
| Top 1,000,000 | 6 | 60.0% |
| Unranked | 1 | 10.0% |
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 7 | 70.0% | |
| .eu | 1 | 10.0% | |
| .net | 1 | 10.0% | |
| .org | 1 | 10.0% |
Because T-Online appears as the primary MX for many high-traffic and established German sites—rather than just consumer domains—organisations sending into the German market must account for T-Online's acceptance criteria as a distinct segment within their deliverability strategy. Testing and monitoring T-Online delivery separately from other European providers is essential for verifying that mail from your infrastructure reaches German recipients reliably, particularly when those recipients are affiliated with enterprise or well-known domains.
See the full T-Online data page (KPI cards, trend, sample domains) →
Yes, if you send to German recipients or domains in the .de namespace; T-Online's concentration among high-traffic and enterprise sites in Germany makes it a primary barometer for German mail deliverability.
10 domains in the Tranco top-1M use T-Online as their mailbox provider as of July 13, 2026 (0.00% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
T-Online accounts for 0.00% 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.
T-Online's largest TLD is .de (70.0% of its domains); it appears across 4 TLDs in total.