CSOF (DE) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), CSOF (DE) is the mailbox provider for 472 domains — 0.07% of 666,213 domains with MX records. Its strongest TLD is .com (43.6% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-11 DNS snapshot.
What CSOF (DE) represents in this dataset
Niche German hosting (Computer Service Online Folkesund).
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.
What the 2026-09-11 snapshot shows about CSOF (DE)
Across 70 distinct TLDs its top three are .com (43.6%), .net (11.4%), .biz (7.0%) — together 62.1% of the 472 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Mailspike (ESP, 461 domains, 97.7% of them). 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 (2026-09-11); 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 CSOF (DE)
What else the same 472 domains use — cross-tabulated from the same daily snapshot (2026-09-11).
| Type | Service | Domains | Share of CSOF (DE) users |
|---|---|---|---|
| ESP | Mailspike | 461 | 97.7% |
TLD distribution (top 30 of 70)
Frequently asked questions
How many domains use CSOF (DE)?
472 domains in the Tranco top-1M use CSOF (DE) as their mailbox provider as of September 11, 2026, according to Live Direct Marketing's daily DNS scan.
What is CSOF (DE)'s market share?
CSOF (DE) holds 0.07% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-11). The number is recomputed every day.
What are the biggest alternatives to CSOF (DE)?
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 2026-09-11).
Largest mailbox providers in this category
Self-Hosted (22.45%) · Google Workspace (21.65%) · Microsoft 365 (16.96%) · Unknown / Other (6.58%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.94%) · Proofpoint (1.88%) · Cloudflare Email Routing (1.74%) · Yandex 360 (1.61%) · Mimecast (1.46%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 472 domains.