CSC (corporate) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 22, 2026), CSC (corporate) is the mailbox provider for 479 domains — 0.07% of 675,663 domains with MX records. Its strongest TLD is .com (40.7% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-22 DNS snapshot.
What CSC (corporate) represents in this dataset
CSC Digital Brand Services — corporate registrar.
Directory category: Corporate. 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 2026-09-22 snapshot shows about CSC (corporate)
Across 99 distinct TLDs its top three are .com (40.7%), .net (4.4%), .co.uk (4.2%) — together 49.3% of the 479 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Amazon SES (ESP, 7 domains, 1.5% of them), followed by Mimecast (0.8%). 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 (2026-09-22); 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 CSC (corporate)
What else the same 479 domains use — cross-tabulated from the same daily snapshot (2026-09-22).
| Type | Service | Domains | Share of CSC (corporate) users |
|---|---|---|---|
| ESP | Amazon SES | 7 | 1.5% |
| ESP | Mimecast | 4 | 0.8% |
| ESP | Mailjet (Sinch) | 4 | 0.8% |
| ESP | SendGrid (Twilio) | 4 | 0.8% |
| ESP | Masiv | 3 | 0.6% |
| ESP | Mailgun | 3 | 0.6% |
| ESP | HubSpot | 2 | 0.4% |
| ESP | Proofpoint | 2 | 0.4% |
| ESP | Elastic Email | 2 | 0.4% |
| ESP | Marketo (Adobe) | 2 | 0.4% |
TLD distribution (top 30 of 99)
Frequently asked questions
How many domains use CSC (corporate)?
479 domains in the Tranco top-1M use CSC (corporate) as their mailbox provider as of September 22, 2026, according to Live Direct Marketing's daily DNS scan.
What is CSC (corporate)'s market share?
CSC (corporate) holds 0.07% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-22). The number is recomputed every day.
What are the biggest alternatives to CSC (corporate)?
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 2026-09-22).
Largest mailbox providers in this category
Self-Hosted (22.50%) · Google Workspace (21.59%) · Microsoft 365 (17.05%) · Unknown / Other (6.67%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.95%) · Proofpoint (1.86%) · Cloudflare Email Routing (1.77%) · Yandex 360 (1.67%) · Mimecast (1.47%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 479 domains.