Strato (DE) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 10, 2026), Strato (DE) is the mailbox provider for 1,243 domains — 0.19% of 667,099 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 1,243 domains in the Tranco top-1M use Strato (DE) (0.19% of domains with MX records).
- Snapshot date: 2026-09-10 — recomputed every day.
- Strongest TLD: .de (60.5% of its domains).
- Region skew: Germany.
- Most co-used service: Mailgun.
- Directory category: hosting mail bundle.
Why Strato (DE) appears in this category
United Internet brand, mass-market German hosting + mail.
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.
Strato is a German email and web hosting provider operating primarily within the .de namespace, serving small-to-medium businesses with mailbox infrastructure and related services.
Strato's concentration in the long tail of smaller sites—rather than among global megaplatforms—means email traffic involving Strato reflects regional, dispersed sender profiles where domain authentication signals and local sender history often carry more weight than global IP-based reputation. For senders, this translates to the need for rigorous SPF and DKIM alignment; for recipients, inbox filtering tends to weight authentication consistency more heavily.
Where Strato (DE) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.1% |
| Top 100,000 | 14 | 1.1% |
| Top 1,000,000 | 1,190 | 95.7% |
| Unranked | 38 | 3.1% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 752 | 60.5% | |
| .com | 235 | 18.9% | |
| .net | 57 | 4.6% | |
| .nl | 39 | 3.1% | |
| .org | 38 | 3.1% | |
| .eu | 30 | 2.4% | |
| .info | 24 | 1.9% | |
| .es | 9 | 0.7% | |
| .shop | 6 | 0.5% | |
| .fr | 5 | 0.4% |
What Strato (DE) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,243 domains.
| Type | Service | Domains | Share of Strato (DE) users |
|---|---|---|---|
| ESP | Mailgun | 16 | 1.3% |
| ESP | Zendesk | 13 | 1.0% |
| ESP | Amazon SES | 11 | 0.9% |
| ESP | Mailjet (Sinch) | 11 | 0.9% |
| ESP | Constant Contact | 8 | 0.6% |
| ESP | Brevo (ex-Sendinblue) | 7 | 0.6% |
| ESP | MailerLite | 6 | 0.5% |
| ESP | Mandrill | 5 | 0.4% |
| ESP | Newsletter2Go (Brevo) | 4 | 0.3% |
| ESP | Elastic Email | 4 | 0.3% |
Authentication integrity in helpdesk forwarding chains
Strato's frequent co-occurrence with Zendesk and similar support platforms means many hosted mailboxes handle forwarded tickets, customer feedback, and multi-layer communication workflows. These integrations often rewrite message headers or modify the envelope sender, which can degrade or break SPF alignment and DKIM signatures. Senders should verify that authentication credentials remain intact across forwarding and handoff points, particularly when messages pass through support integration layers before delivery.
See the full Strato (DE) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against Strato-hosted inboxes specifically?
If your recipient base includes notable German-market traffic or .de domains, testing with Strato addresses is worthwhile, as authentication and regional sender reputation patterns may differ from global ISPs. This is especially important if messages are likely to pass through helpdesk or ticketing-system forwarding workflows.
How many domains use Strato (DE)?
1,243 domains in the Tranco top-1M use Strato (DE) as their mailbox provider as of September 10, 2026 (0.19% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Strato (DE) common enough to affect email deliverability testing?
Strato (DE) accounts for 0.19% 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 Strato (DE) most?
Strato (DE)'s largest TLD is .de (60.5% of its domains); it appears across 45 TLDs in total.