Greenhouse SaaS sender
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Greenhouse is the SaaS sender for 615 domains — 0.10% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 615 domains in the Tranco top-1M use Greenhouse (0.10% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- 30-day share change: -0.00 pp.
- Strongest TLD: .com (72.0% of its domains).
- Most co-used service: Google Workspace.
- Directory category: SaaS sender.
Why Greenhouse appears in this category
Greenhouse — applicant tracking system widely used by mid-market and enterprise recruiters in North America.
We classify it as a SaaS sender 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.
Greenhouse is a SaaS platform operated by Greenhouse Software that sends transactional and notification email on behalf of customer domains, chiefly within talent acquisition and recruitment workflows. The platform's presence is identified in email infrastructure through SPF include mechanisms published by domains that have integrated Greenhouse for outbound mail delivery.
Greenhouse's infrastructure footprint concentrates among established, high-traffic organisations running .com domains, and is frequently observed in conjunction with Google Workspace. For mail receivers, this pattern identifies a cohort of legitimate enterprise senders; for mail senders using Greenhouse, it reflects the platform's adoption amongst organisations with demanding deliverability and compliance requirements.
Where Greenhouse sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 8 | 1.3% |
| Top 10,000 | 46 | 7.5% |
| Top 100,000 | 143 | 23.3% |
| Top 1,000,000 | 415 | 67.5% |
| Unranked | 3 | 0.5% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 443 | 72.0% | |
| .org | 36 | 5.9% | |
| .io | 32 | 5.2% | |
| .ai | 25 | 4.1% | |
| .co | 13 | 2.1% | |
| .net | 6 | 1.0% | |
| .tv | 4 | 0.7% | |
| .de | 3 | 0.5% | |
| .pl | 3 | 0.5% | |
| .ca | 3 | 0.5% |
What Greenhouse users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 615 domains.
| Type | Service | Domains | Share of Greenhouse users |
|---|---|---|---|
| Mailbox | Google Workspace | 375 | 61.0% |
| Mailbox | Microsoft 365 | 138 | 22.4% |
| Mailbox | Proofpoint | 36 | 5.9% |
| Mailbox | Mimecast | 31 | 5.0% |
| Mailbox | Sophos MXrecord | 5 | 0.8% |
| Mailbox | Proofpoint Essentials | 5 | 0.8% |
Authentication alignment in enterprise sender clusters
Greenhouse's concentration among Google Workspace–using enterprises means its traffic patterns inherit reputational signals from a tight sender cohort. When a domain publishes an SPF include for Greenhouse but lacks proper DKIM signing on Greenhouse-originated mail, or when DMARC policy is absent or non-enforced, receiving systems see misalignment between the sender's claimed infrastructure (SPF) and its actual cryptographic identity. In high-value enterprise segments, such gaps are more likely to trigger scrutiny, as filtering algorithms expect DMARC enforcement and full authentication alignment from organisations that claim Google Workspace and Greenhouse simultaneously.
See the full Greenhouse data page (KPI cards, trend, sample domains) →
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Frequently asked questions
If my domain uses Greenhouse for recruitment email, will that affect my general mail deliverability?
Greenhouse affects only the mail streams routed through Greenhouse; other mail from your domain uses separate infrastructure and authentication chains. Your overall reputation depends on the combined behaviour of all your mail sources, so if Greenhouse-sent recruiting mail maintains proper SPF and DKIM alignment, it will not degrade the reputation of mail sent via Google Workspace or other providers.
How many domains use Greenhouse?
615 domains in the Tranco top-1M use Greenhouse as their SaaS sender as of September 14, 2026 (0.10% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Greenhouse common enough to affect email deliverability testing?
Greenhouse accounts for 0.10% 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.
Is Greenhouse growing or declining?
Greenhouse has been stable — its share moved -0.00 pp over the last 30 days (as of September 14, 2026).
Which countries or TLDs use Greenhouse most?
Greenhouse's largest TLD is .com (72.0% of its domains); it appears across 50 TLDs in total.