According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Greenhouse is the SaaS sender for 612 domains — 0.10% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 11 | 1.8% |
| Top 10,000 | 41 | 6.7% |
| Top 100,000 | 161 | 26.3% |
| Top 1,000,000 | 381 | 62.3% |
| Unranked | 18 | 2.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 442 | 72.2% | |
| .org | 34 | 5.6% | |
| .io | 28 | 4.6% | |
| .ai | 24 | 3.9% | |
| .co | 15 | 2.5% | |
| .net | 5 | 0.8% | |
| .tv | 4 | 0.7% | |
| .de | 4 | 0.7% | |
| .ca | 4 | 0.7% | |
| .health | 3 | 0.5% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 612 domains.
| Type | Service | Domains | Share of Greenhouse users |
|---|---|---|---|
| Mailbox | Google Workspace | 373 | 60.9% |
| Mailbox | Microsoft 365 | 135 | 22.1% |
| Mailbox | Proofpoint | 36 | 5.9% |
| Mailbox | Mimecast | 28 | 4.6% |
| Mailbox | Self-Hosted | 6 | 1.0% |
| Mailbox | Proofpoint Essentials | 5 | 0.8% |
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) →
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.
612 domains in the Tranco top-1M use Greenhouse as their SaaS sender as of July 13, 2026 (0.10% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
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.
Greenhouse has been stable — its share moved -0.00 pp over the last 30 days (as of July 13, 2026).
Greenhouse's largest TLD is .com (72.2% of its domains); it appears across 51 TLDs in total.