# Companies that use turboSMTP

As of October 2026, 2,275 companies show public evidence of using turboSMTP (SMTP relay and transactional email), according to runsonwhat.

- Tool: [turboSMTP](https://serversmtp.com), category [Email Delivery](https://www.runsonwhat.com/tools/email-delivery)
- Companies using it now: 2,275
- Stopped using it (seen on a same-method rescan): 0
- Started in the last 30 days: 1

## Who uses turboSMTP

Segments where turboSMTP customers are more common than among all companies we track:

- Construction: 2.6× more likely (106 customers)

## turboSMTP customers by industry

| Industry | Share of customers |
|---|---|
| IT Services | 14% |
| Construction | 8.6% |
| Software | 6.2% |
| Marketing and Advertising | 6.1% |
| Management Consulting | 6.0% |
| Retail | 4.8% |
| Financial Services | 4.1% |
| Hospitality | 4.1% |

## turboSMTP customers by company size

| Company size | Share of customers |
|---|---|
| 1–10 employees | 1.4% |
| 11–50 employees | 53% |
| 51–200 employees | 29% |
| 201–1,000 employees | 13% |
| 1,001–5,000 employees | 3.2% |
| 5,001–10,000 employees | 0.44% |
| 10,000+ employees | 0.39% |

## turboSMTP customers by country

| Country | Share of customers |
|---|---|
| Italy | 47% |
| United States | 12% |
| France | 6.7% |
| United Kingdom | 4.5% |
| Germany | 4.0% |
| Canada | 3.0% |
| Netherlands | 2.7% |
| Australia | 2.5% |

## Alternatives to turboSMTP

| Tool | Companies |
|---|---|
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | 188,552 |
| [Amazon SES](https://www.runsonwhat.com/reverse/ses) | 58,195 |
| [Mailchimp Transactional](https://www.runsonwhat.com/reverse/mandrill) | 55,987 |
| [Mailgun](https://www.runsonwhat.com/reverse/mailgun) | 47,333 |
| [Resend](https://www.runsonwhat.com/reverse/resend) | 25,157 |
| [Mailjet](https://www.runsonwhat.com/reverse/mailjet) | 24,067 |
| [MailChannels](https://www.runsonwhat.com/reverse/mailchannels) | 21,795 |
| [Postmark](https://www.runsonwhat.com/reverse/postmark) | 15,538 |
| [Elastic Email](https://www.runsonwhat.com/reverse/elasticemail) | 9,095 |
| [SparkPost](https://www.runsonwhat.com/reverse/sparkpost) | 5,987 |

## turboSMTP customers also use

- [MailUp](https://www.runsonwhat.com/reverse/mailup): 4.9% of turboSMTP customers, 21× the average company
- [Aruba.it](https://www.runsonwhat.com/reverse/aruba): 8.4% of turboSMTP customers, 13× the average company
- [iubenda](https://www.runsonwhat.com/reverse/iubenda): 13% of turboSMTP customers, 12× the average company
- [Mailjet](https://www.runsonwhat.com/reverse/mailjet): 4.9% of turboSMTP customers, 2.1× the average company
- [Brevo](https://www.runsonwhat.com/reverse/brevo): 15% of turboSMTP customers, 2.0× the average company
- [OVHcloud](https://www.runsonwhat.com/reverse/ovh): 4.9% of turboSMTP customers, 1.9× the average company
- [Matomo](https://www.runsonwhat.com/reverse/matomo): 5.5% of turboSMTP customers, 1.9× the average company
- [Exclaimer](https://www.runsonwhat.com/reverse/exclaimer): 5.6% of turboSMTP customers, 1.7× the average company
- [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads): 18% of turboSMTP customers, 1.7× the average company
- [Cookiebot](https://www.runsonwhat.com/reverse/cookiebot): 8.6% of turboSMTP customers, 1.5× the average company

## Companies that use turboSMTP (first 40 of 2,275)

| Company | Domain | Industry | Country |
|---|---|---|---|
| [Sunat](https://www.runsonwhat.com/company/sunat.gob.pe) | sunat.gob.pe | Government Administration | Peru |
| [My-personaltrainer](https://www.runsonwhat.com/company/my-personaltrainer.it) | my-personaltrainer.it |  |  |
| [SSS](https://www.runsonwhat.com/company/sss.gov.ph) | sss.gov.ph |  |  |
| [101 Caffè SRL](https://www.runsonwhat.com/company/101caffe.it) | 101caffe.it | Food & Beverages | Italy |
| [1decision](https://www.runsonwhat.com/company/1decision.co.uk) | 1decision.co.uk | Higher Education | United Kingdom |
| [2ac Aquitaine](https://www.runsonwhat.com/company/2acaquitaine.fr) | 2acaquitaine.fr | Accounting | France |
| [2db Limited](https://www.runsonwhat.com/company/2db.com) | 2db.com | Software | United Kingdom |
| [3d Energy SRL](https://www.runsonwhat.com/company/3denergy.it) | 3denergy.it | IT Services | Italy |
| [3effe S.r.l.](https://www.runsonwhat.com/company/3effe.com) | 3effe.com | Wholesale | Italy |
| [3F - Fechaduras e Cadeados](https://www.runsonwhat.com/company/3f.com.br) | 3f.com.br | Construction | Brazil |
| [4clegal](https://www.runsonwhat.com/company/4clegal.com) | 4clegal.com | Legal Services | Italy |
| [4intelligence](https://www.runsonwhat.com/company/4intelligence.ai) | 4intelligence.ai | Internet | Brazil |
| [4m Automation Group](https://www.runsonwhat.com/company/4m.gr) | 4m.gr | Software | Greece |
| [5GAA](https://www.runsonwhat.com/company/5gaa.org) | 5gaa.org | Automotive | Germany |
| [A3t S.a.](https://www.runsonwhat.com/company/a3t.lu) | a3t.lu | Accounting | Luxembourg |
| [aaeaaconsulting.it](https://www.runsonwhat.com/company/aaeaaconsulting.it) | aaeaaconsulting.it | Insurance | Italy |
| [Aalas](https://www.runsonwhat.com/company/aalas.org) | aalas.org |  |  |
| [AAMPS](https://www.runsonwhat.com/company/aamps.livorno.it) | aamps.livorno.it | Utilities | Italy |
| [Abalone Group](https://www.runsonwhat.com/company/abalonegroup.com) | abalonegroup.com | Financial Services | Malta |
| [Abbott Construction](https://www.runsonwhat.com/company/abbottconstruction.com) | abbottconstruction.com | Construction | United States |
| [ABF](https://www.runsonwhat.com/company/abf-inc.com) | abf-inc.com | Construction | Canada |
| [Adminbase](https://www.runsonwhat.com/company/abinitiosoftware.co.uk) | abinitiosoftware.co.uk | IT Services | United Kingdom |
| [Abix Telecom](https://www.runsonwhat.com/company/abix.mx) | abix.mx | Telecommunications | Mexico |
| [Abnex Softech](https://www.runsonwhat.com/company/abnexsoftech.com) | abnexsoftech.com | IT Services | India |
| [Al Barrak Group](https://www.runsonwhat.com/company/absaco.com) | absaco.com | Logistics and Supply Chain | Saudi Arabia |
| [Acacia Collections](https://www.runsonwhat.com/company/acaciacollections.com) | acaciacollections.com | Hospitality | Tanzania |
| [Académie Lavalloise](https://www.runsonwhat.com/company/academielavalloise.com) | academielavalloise.com | Education Management | Canada |
| [A.c.a - Auditeurs & Comptables Associés](https://www.runsonwhat.com/company/acafrance.fr) | acafrance.fr | Accounting | France |
| [Accadueo - H2o](https://www.runsonwhat.com/company/accadueo.com) | accadueo.com | Utilities | Italy |
| [Accurate Reviews](https://www.runsonwhat.com/company/accuratereviews.com) | accuratereviews.com | Publishing | United States |
| [Acea Costruzioni S.p.a.](https://www.runsonwhat.com/company/aceacostruzioni.it) | aceacostruzioni.it | Construction | Italy |
| [Atlantic Constructors, Inc.](https://www.runsonwhat.com/company/acibuilds.com) | acibuilds.com | Construction | United States |
| [Acne Revolution](https://www.runsonwhat.com/company/acnerevolution.it) | acnerevolution.it | Medical Practice | Italy |
| [Acquajoss](https://www.runsonwhat.com/company/acquajoss.it) | acquajoss.it | Entertainment | Italy |
| [Acquatica S.p.a](https://www.runsonwhat.com/company/acquatica.net) | acquatica.net | Retail | Italy |
| [albo fornitori \| albo professionisti \| gara telematica](https://www.runsonwhat.com/company/acquistitelematici.it) | acquistitelematici.it | Utilities | Italy |
| [ACTALIA](https://www.runsonwhat.com/company/actalia.eu) | actalia.eu | Food Production | France |
| [Activereach LTD](https://www.runsonwhat.com/company/activereach.net) | activereach.net | IT Services | United Kingdom |
| [Activus - Accounting, Audit And Tax Advisors](https://www.runsonwhat.com/company/activus.co.uk) | activus.co.uk | IT Services | United Kingdom |
| [ACTUATECH S.p.A.](https://www.runsonwhat.com/company/actuatech.com) | actuatech.com | Industrial Automation | Italy |

The full list is on https://www.runsonwhat.com/reverse/turbosmtp for signed-in users.

## FAQ

### How many companies use turboSMTP?

As of October 2026, 2,275 companies show public evidence of using turboSMTP across the 1,791,179 company domains runsonwhat tracks. That makes turboSMTP the 14th most used of the 20 Email Delivery tools with confirmed customers, behind AuthSMTP (2,392). The number is a lower bound: a company counts only when a public record, such as a DNS entry or turboSMTP's code on its website, shows the tool in use.

### Which companies use turboSMTP?

Companies that use turboSMTP include Sunat, My-personaltrainer, SSS, 101 Caffè and 1decision, according to runsonwhat's public-record scans (October 2026). The biggest industries among turboSMTP customers are IT services (14%) and construction (8.6%). The full list of 2,275 companies can be filtered by industry, company size and country on runsonwhat's turboSMTP page.

### What industries use turboSMTP the most?

The industries with the most turboSMTP customers are IT services (14%), construction (8.6%) and software (6.2%), based on the 1,234 companies with a known industry. Relative to all companies runsonwhat tracks, turboSMTP stands out most in construction (2.6× the average rate).

### Is turboSMTP more popular with startups or large companies?

turboSMTP is used mostly by small companies: of the 2,036 companies with a known size, 54% have up to 50 employees, 42% have 51 to 1,000 and 4.1% have more than 1,000.

### Which countries use turboSMTP the most?

Most turboSMTP customers runsonwhat has found are based in Italy (47%), the United States (12%) and France (6.7%), out of 1,888 companies with a known country.

### Is turboSMTP gaining or losing customers?

In the 90 days to October 2026, 37 companies started using turboSMTP and 1 company stopped, a net gain of 36. runsonwhat counts a start or a stop only between two checks of the same company done the same way, so a change in how a site is scanned never shows up as churn.

### What are the most popular alternatives to turboSMTP?

By the number of companies using them, the most used Email Delivery tools other than turboSMTP are SendGrid (189,006), Amazon SES (58,367), Mailchimp Transactional (56,119) and Mailgun (47,479), according to runsonwhat (October 2026). Not every tool in a category does the same job, so check each one's page; runsonwhat ranks all Email Delivery tools at https://www.runsonwhat.com/tools/email-delivery.

### What other tools do turboSMTP customers use?

turboSMTP customers use MailUp, Aruba.it and iubenda far more often than the average company. For example, 4.8% of turboSMTP customers also run MailUp, 21× the rate among all companies runsonwhat tracks, and 8.3% run Aruba.it.

### How does runsonwhat know a company uses turboSMTP?

runsonwhat reads public records only. For turboSMTP, that means email records (SPF, MX or DKIM) that authorize turboSMTP or turboSMTP on the company's own subprocessor list. A company is listed only when one of these direct records is present, and each match keeps the record it came from. DNS is rechecked weekly and websites about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/reverse/turbosmtp (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.