Retarus email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 20, 2026), Retarus is the mailbox provider for 119 domains — 0.02% of 676,114 domains with MX records. Its strongest TLD is .de (39.5% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-20 DNS snapshot.
What Retarus represents in this dataset
German large-enterprise messaging services / email gateway.
Directory category: Gateway. 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.
What the 2026-09-20 snapshot shows about Retarus
Across 22 distinct TLDs its top three are .de (39.5%), .com (28.6%), .fr (7.6%) — together 75.6% of the 119 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 Retarus (DE gateway) (ESP, 87 domains, 73.1% of them), followed by IP Made (CDP) (15.1%). 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 (2026-09-20); 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.
Commonly used together with Retarus
What else the same 119 domains use — cross-tabulated from the same daily snapshot (2026-09-20).
| Type | Service | Domains | Share of Retarus users |
|---|---|---|---|
| ESP | Retarus (DE gateway) | 87 | 73.1% |
| ESP | IP Made (CDP) | 18 | 15.1% |
| ESP | Amazon SES | 7 | 5.9% |
| ESP | Salesforce Marketing Cloud | 6 | 5.0% |
| ESP | Salesforce | 6 | 5.0% |
| ESP | Mailjet (Sinch) | 6 | 5.0% |
| ESP | Brevo (ex-Sendinblue) | 5 | 4.2% |
| ESP | Mandrill | 5 | 4.2% |
| ESP | Constant Contact | 4 | 3.4% |
| ESP | Zendesk | 4 | 3.4% |
TLD distribution (top 22 of 22)
Frequently asked questions
How many domains use Retarus?
119 domains in the Tranco top-1M use Retarus as their mailbox provider as of September 20, 2026, according to Live Direct Marketing's daily DNS scan.
What is Retarus's market share?
Retarus holds 0.02% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-20). The number is recomputed every day.
What are the biggest alternatives to Retarus?
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 2026-09-20).
Largest mailbox providers in this category
Self-Hosted (22.47%) · Google Workspace (21.58%) · Microsoft 365 (17.07%) · Unknown / Other (6.68%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.95%) · Proofpoint (1.87%) · Cloudflare Email Routing (1.76%) · Yandex 360 (1.66%) · Mimecast (1.47%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 119 domains.