Generic / unmatched (smtp.*) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), Generic / unmatched (smtp.*) is the mailbox provider for 1,053 domains — 0.16% of 675,489 domains with MX records. Its strongest TLD is .com (30.5% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-24 DNS snapshot.
What Generic / unmatched (smtp.*) represents in this dataset
Hosts named "smtp.<apex>" not matching a known operator.
Directory category: Generic. 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 2026-09-24 snapshot shows about Generic / unmatched (smtp.*)
Across 128 distinct TLDs its top three are .com (30.5%), .net (7.9%), .org (6.0%) — together 44.3% of the 1,053 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, 41 domains, 3.9% of them), followed by SendGrid (Twilio) (2.2%). 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 (2026-09-24); 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 Generic / unmatched (smtp.*)
What else the same 1,053 domains use — cross-tabulated from the same daily snapshot (2026-09-24).
| Type | Service | Domains | Share of Generic / unmatched (smtp.*) users |
|---|---|---|---|
| ESP | Amazon SES | 41 | 3.9% |
| ESP | SendGrid (Twilio) | 23 | 2.2% |
| ESP | Mailjet (Sinch) | 21 | 2.0% |
| ESP | Mailchimp | 16 | 1.5% |
| ESP | Mandrill | 15 | 1.4% |
| ESP | Mailgun | 10 | 0.9% |
| ESP | Unisender (RU) | 8 | 0.8% |
| ESP | HubSpot | 8 | 0.8% |
| ESP | Salesforce | 8 | 0.8% |
| ESP | Zendesk | 8 | 0.8% |
TLD distribution (top 30 of 128)
Frequently asked questions
How many domains use Generic / unmatched (smtp.*)?
1,053 domains in the Tranco top-1M use Generic / unmatched (smtp.*) as their mailbox provider as of September 24, 2026, according to Live Direct Marketing's daily DNS scan.
What is Generic / unmatched (smtp.*)'s market share?
Generic / unmatched (smtp.*) holds 0.16% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-24). The number is recomputed every day.
What are the biggest alternatives to Generic / unmatched (smtp.*)?
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 2026-09-24).
Largest mailbox providers in this category
Self-Hosted (22.56%) · Google Workspace (21.58%) · Microsoft 365 (17.03%) · Unknown / Other (6.68%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.93%) · Proofpoint (1.86%) · Cloudflare Email Routing (1.76%) · Yandex 360 (1.67%) · Mimecast (1.47%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 1,053 domains.