Salsa Labs email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 22, 2026), Salsa Labs is the email service provider (ESP) for 212 domains — 0.03% of 637,585 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 212 domains in the Tranco top-1M use Salsa Labs (0.03% of SPF-publishing domains).
- Snapshot date: 2026-09-22 — recomputed every day.
- Strongest TLD: .org (76.4% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Salsa Labs appears in this category
Salsa Labs — nonprofit advocacy + email engagement.
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Salsa Labs is an email service provider that appears in email authentication records as a third-party SPF include, indicating it sends email on behalf of organisations using its platform. The provider operates across a distributed base of organisations rather than concentrating on major brands.
Salsa Labs' footprint is notably concentrated in the .org domain space and is most frequently observed in tandem with Google Workspace, a pattern suggesting organisations that maintain separate email sending infrastructure whilst keeping Google Workspace for other business functions. For email professionals, recognising Salsa Labs in authentication records provides insight into sender infrastructure and the parties responsible for email authentication and delivery.
Where Salsa Labs sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.5% |
| Top 10,000 | 2 | 0.9% |
| Top 100,000 | 29 | 13.7% |
| Top 1,000,000 | 180 | 84.9% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .org | 162 | 76.4% | |
| .com | 41 | 19.3% | |
| .net | 4 | 1.9% | |
| .edu | 4 | 1.9% | |
| .coop | 1 | 0.5% |
What Salsa Labs users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 212 domains.
| Type | Service | Domains | Share of Salsa Labs users |
|---|---|---|---|
| Mailbox | Google Workspace | 110 | 51.9% |
| Mailbox | Microsoft 365 | 66 | 31.1% |
| Mailbox | Proofpoint Essentials | 9 | 4.2% |
| Mailbox | Mimecast | 5 | 2.4% |
| Mailbox | Self-Hosted | 4 | 1.9% |
| Mailbox | Unknown / Other | 4 | 1.9% |
| ESP | NGP VAN | 64 | 30.2% |
| ESP | MailChannels | 34 | 16.0% |
| ESP | SendGrid (Twilio) | 26 | 12.3% |
| ESP | Mailchimp | 24 | 11.3% |
SPF includes and third-party email delegation
Salsa Labs appears in email systems as a third-party SPF include, an authentication mechanism that authorises the platform to send email on behalf of its clients. This delegation pattern is typical in organisations managing email sending separately from other business functions. When paired with Google Workspace, as it frequently is, it reflects a layered infrastructure where internal productivity systems and email sending are handled by different vendors. This matters for senders troubleshooting SPF, DKIM, and DMARC alignment, and for receivers conducting reputation assessment during email evaluation.
See the full Salsa Labs data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Salsa Labs in email infrastructure?
Salsa Labs is an email service provider that sends email on behalf of its clients through third-party SPF delegation. Its user base is concentrated in the <code>.org</code> domain space and frequently overlaps with Google Workspace users.
How many domains use Salsa Labs?
212 domains in the Tranco top-1M use Salsa Labs as their email service provider (ESP) as of September 22, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Salsa Labs common enough to affect email deliverability testing?
Salsa Labs accounts for 0.03% of SPF-publishing domains in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Which countries or TLDs use Salsa Labs most?
Salsa Labs's largest TLD is .org (76.4% of its domains); it appears across 5 TLDs in total.