Hornetsecurity mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 18, 2026), Hornetsecurity is the mailbox provider for 1,610 domains — 0.24% of 675,783 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 1,610 domains in the Tranco top-1M use Hornetsecurity (0.24% of domains with MX records).
- Snapshot date: 2026-09-18 — recomputed every day.
- Strongest TLD: .de (40.1% of its domains).
- Region skew: Germany.
- Most co-used service: Hornetsecurity.
- Directory category: email security gateway.
Why Hornetsecurity appears in this category
European cloud email security suite.
We classify it as a email security gateway 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.
Hornetsecurity is a hosted email platform that provides mailbox hosting and inbound email security services to organisations. It operates as a multi-tenant service rather than a consumer email offering.
Hornetsecurity's deployment pattern clusters in small to mid-market organisations, particularly in German-speaking regions, though it is used internationally across diverse TLDs. This distribution — numerous but individually modest in scale — has deliverability implications: because many smaller organisations share the platform, its collective reputation and filtering logic differ from both the hyperscale inboxes and single-organisation mail systems. For senders, this means Hornetsecurity warrants dedicated testing attention, particularly when targeting organisations in Europe.
Where Hornetsecurity sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 8 | 0.5% |
| Top 100,000 | 119 | 7.4% |
| Top 1,000,000 | 1,467 | 91.1% |
| Unranked | 15 | 0.9% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 645 | 40.1% | |
| .com | 439 | 27.3% | |
| .fr | 140 | 8.7% | |
| .org | 41 | 2.5% | |
| .co.uk | 40 | 2.5% | |
| .at | 33 | 2.0% | |
| .net | 33 | 2.0% | |
| .es | 31 | 1.9% | |
| .ch | 22 | 1.4% | |
| .eu | 21 | 1.3% |
What Hornetsecurity users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,610 domains.
| Type | Service | Domains | Share of Hornetsecurity users |
|---|---|---|---|
| ESP | Hornetsecurity | 1,210 | 75.2% |
| ESP | Mailjet (Sinch) | 158 | 9.8% |
| ESP | Amazon SES | 125 | 7.8% |
| ESP | Brevo (ex-Sendinblue) | 96 | 6.0% |
| ESP | Constant Contact | 90 | 5.6% |
| ESP | Zendesk | 69 | 4.3% |
| ESP | Mailchimp | 65 | 4.0% |
| ESP | HubSpot | 64 | 4.0% |
| ESP | Salesforce | 63 | 3.9% |
| ESP | Mailgun | 62 | 3.9% |
Multi-tenant reputation and filtering dynamics
As a hosted platform serving many smaller organisations simultaneously, Hornetsecurity's inbound filtering and reputation scoring reflect the aggregate security posture of its entire customer base. This differs from testing against a single organisation's mail server or a hyperscale consumer inbox; a sender's deliverability at Hornetsecurity is influenced both by their own domain reputation and by how the platform evaluates traffic patterns across all its tenants. This multi-tenant dynamic means sender authentication and sending patterns must account for provider-level filtering in addition to recipient-organisation policies.
See the full Hornetsecurity data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should Hornetsecurity be included in email deliverability testing?
Yes — its widespread deployment across European mid-market organisations makes it a material audience. Its filtering and reputation practices, shaped by many smaller senders and organisations, often reveal issues that hyperscale-focused testing misses.
How many domains use Hornetsecurity?
1,610 domains in the Tranco top-1M use Hornetsecurity as their mailbox provider as of September 18, 2026 (0.24% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Hornetsecurity common enough to affect email deliverability testing?
Hornetsecurity accounts for 0.24% 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 Hornetsecurity most?
Hornetsecurity's largest TLD is .de (40.1% of its domains); it appears across 76 TLDs in total.