Turbo-SMTP email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), Turbo-SMTP is the email service provider (ESP) for 984 domains — 0.16% of 631,089 SPF-publishing domains. Its strongest TLD is .com (34.6% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-11 DNS snapshot.
What Turbo-SMTP represents in this dataset
Italian SMTP relay service.
Directory category: Esp. The classification comes from include: mechanisms in the SPF record. 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 Turbo-SMTP
Across 91 distinct TLDs its top three are .com (34.6%), .it (30.8%), .de (3.3%) — together 68.6% of the 984 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Microsoft 365 (Mailbox, 293 domains, 29.8% of them), followed by Self-Hosted (20.7%). Directly comparable by the same detection rule: Amazon SES, SendGrid (Twilio), Mailgun. 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 include: mechanisms in the SPF record rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with Turbo-SMTP
What else the same 984 domains use — cross-tabulated from the same daily snapshot (2026-09-11).
| Type | Service | Domains | Share of Turbo-SMTP users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 293 | 29.8% |
| Mailbox | Self-Hosted | 204 | 20.7% |
| Mailbox | Google Workspace | 188 | 19.1% |
| Mailbox | Unknown / Other | 84 | 8.5% |
| Mailbox | Generic / unmatched (mx*.*) | 30 | 3.0% |
| Mailbox | Barracuda | 13 | 1.3% |
| ESP | Amazon SES | 85 | 8.6% |
| ESP | MailUp | 69 | 7.0% |
| ESP | Mailchimp | 52 | 5.3% |
| ESP | Zendesk | 51 | 5.2% |
TLD distribution (top 30 of 91)
Frequently asked questions
How many domains use Turbo-SMTP?
984 domains in the Tranco top-1M use Turbo-SMTP as their email service provider (ESP) as of September 11, 2026, according to Live Direct Marketing's daily DNS scan.
What is Turbo-SMTP's market share?
Turbo-SMTP holds 0.16% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-11). The number is recomputed every day.
What are the biggest alternatives to Turbo-SMTP?
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-09-11).
Largest email service provider (ESP)s in this category
Amazon SES (6.17%) · SendGrid (Twilio) (4.63%) · Mailgun (4.00%) · Zendesk (3.76%) · Mailchimp (3.56%) · Mandrill (3.24%) · HubSpot (3.10%) · Salesforce (2.54%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.93%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 984 domains.