Turbo-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), Turbo-SMTP is the email service provider (ESP) for 983 domains — 0.15% of 637,420 SPF-publishing domains. Its strongest TLD is .com (35.0% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-24 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 2026-09-24 snapshot shows about Turbo-SMTP
Across 90 distinct TLDs its top three are .com (35.0%), .it (29.8%), .org (3.3%) — together 68.1% of the 983 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, 295 domains, 30.0% of them), followed by Self-Hosted (20.0%). 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 (2026-09-24); 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 983 domains use — cross-tabulated from the same daily snapshot (2026-09-24).
| Type | Service | Domains | Share of Turbo-SMTP users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 295 | 30.0% |
| Mailbox | Self-Hosted | 197 | 20.0% |
| Mailbox | Google Workspace | 186 | 18.9% |
| Mailbox | Unknown / Other | 82 | 8.3% |
| Mailbox | Generic / unmatched (mx*.*) | 30 | 3.1% |
| Mailbox | Barracuda | 13 | 1.3% |
| ESP | Amazon SES | 85 | 8.6% |
| ESP | MailUp | 68 | 6.9% |
| ESP | Mailjet (Sinch) | 55 | 5.6% |
| ESP | Zendesk | 53 | 5.4% |
TLD distribution (top 30 of 90)
Frequently asked questions
How many domains use Turbo-SMTP?
983 domains in the Tranco top-1M use Turbo-SMTP as their email service provider (ESP) as of September 24, 2026, according to Live Direct Marketing's daily DNS scan.
What is Turbo-SMTP's market share?
Turbo-SMTP holds 0.15% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-24). 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 2026-09-24).
Largest email service provider (ESP)s in this category
Amazon SES (6.23%) · SendGrid (Twilio) (4.68%) · Mailgun (4.01%) · Zendesk (3.77%) · Mailchimp (3.61%) · Mandrill (3.26%) · HubSpot (3.18%) · Salesforce (2.57%) · Mailjet (Sinch) (2.14%) · Cloudflare Email Routing (1.96%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 983 domains.