mailbox
According to Live Direct Marketing's daily Tranco top-1M scan (July 30, 2026), 1&1 IONOS is the mailbox provider for 4,244 domains — 0.64% of 667,152 domains with MX records. Over the last 30 days its share grew by 0.11 pp. Its strongest TLD is .com (43.0% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-07-30 DNS snapshot.
1&1 IONOS — Europe's largest hosting brand, bundled mail for SMB.
Directory category: Hosting. The classification comes from primary MX record (lowest preference). It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
Across 110 distinct TLDs its top three are .com (43.0%), .de (21.3%), .co.uk (6.3%) — together 70.6% of the 4,244 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is Mailjet (Sinch) (ESP, 147 domains, 3.5% of them), followed by MailerSend (1.8%). Its share of domains with MX records moved +0.11 pp in 30 days, a change larger than list churn alone explains. Directly comparable by the same detection rule: Self-Hosted, Google Workspace, Microsoft 365. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-07-30); a domain appears here when its published records match the primary MX record (lowest preference) rule, which is an infrastructure fact, not a commercial relationship.
What else the same 4,244 domains use — cross-tabulated from the same daily snapshot (2026-07-30).
| Type | Service | Domains | Share of 1&1 IONOS users |
|---|---|---|---|
| ESP | Mailjet (Sinch) | 147 | 3.5% |
| ESP | MailerSend | 77 | 1.8% |
| ESP | Brevo (ex-Sendinblue) | 76 | 1.8% |
| ESP | Mailgun | 75 | 1.8% |
| ESP | Amazon SES | 62 | 1.5% |
| ESP | Mailchimp | 45 | 1.1% |
| ESP | Mandrill | 44 | 1.0% |
| ESP | Zendesk | 40 | 0.9% |
| ESP | SendGrid (Twilio) | 39 | 0.9% |
| ESP | Constant Contact | 33 | 0.8% |
4,244 domains in the Tranco top-1M use 1&1 IONOS as their mailbox provider as of July 30, 2026, according to Live Direct Marketing's daily DNS scan.
1&1 IONOS holds 0.64% of domains with MX records in the Tranco top-1M (snapshot of 2026-07-30). The number is recomputed every day.
1&1 IONOS's share grew by 0.11 percentage points over the last 30 days (as of July 30, 2026).
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-07-30).
Self-Hosted (22.74%) · Google Workspace (21.79%) · Microsoft 365 (16.94%) · Unknown / Other (6.79%) · Generic / unmatched (mx*.*) (2.55%) · Proofpoint (1.93%) · Generic / unmatched (mail.*) (1.77%) · Yandex 360 (1.68%) · Cloudflare Email Routing (1.65%) · Mimecast (1.54%)
Showing 100 of 4,244 domains.