ADP SaaS sender
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), ADP is the SaaS sender for 113 domains — 0.02% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 113 domains in the Tranco top-1M use ADP (0.02% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (77.9% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: SaaS sender.
Why ADP appears in this category
ADP — payroll and HR platform.
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.
ADP is a cloud-based email delivery platform used by organisations to send messages on behalf of their domains. As a software-as-a-service provider, it integrates with customer email infrastructure through SPF (Sender Policy Framework) include mechanisms, which allow domains to delegate sending authority to ADP's mail servers.
ADP's footprint in email authentication data is concentrated among smaller and mid-market sites rather than the largest global brands, and predominantly appears in .com domains. It is most commonly observed alongside Microsoft 365 deployments, suggesting it serves organisations that have adopted Microsoft's productivity suite and require additional email delivery capabilities.
Where ADP sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.9% |
| Top 10,000 | 1 | 0.9% |
| Top 100,000 | 22 | 19.5% |
| Top 1,000,000 | 89 | 78.8% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 88 | 77.9% | |
| .org | 10 | 8.8% | |
| .edu | 4 | 3.5% | |
| .com.au | 4 | 3.5% | |
| .au | 2 | 1.8% | |
| .de | 1 | 0.9% | |
| .net | 1 | 0.9% | |
| .eu | 1 | 0.9% | |
| .ca | 1 | 0.9% | |
| .nl | 1 | 0.9% |
What ADP users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 113 domains.
| Type | Service | Domains | Share of ADP users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 51 | 45.1% |
| Mailbox | Proofpoint | 25 | 22.1% |
| Mailbox | Google Workspace | 11 | 9.7% |
| Mailbox | Mimecast | 10 | 8.8% |
| Mailbox | Cisco IronPort | 3 | 2.7% |
| Mailbox | Self-Hosted | 3 | 2.7% |
SPF record complexity when combining ADP with Microsoft 365
Organisations using both ADP and Microsoft 365 must include SPF records for both providers, and DNS query size becomes a practical concern when multiple include mechanisms stack. Each include directive adds resolution overhead; senders should verify their SPF configuration does not exceed the typical DNS answer limits and monitor for potential authentication failures if the query becomes too large.
See the full ADP data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Do I need to add ADP to my SPF record?
Yes—if you send mail through ADP, you must add its SPF include to your domain's SPF record to ensure deliverability and proper authentication. ADP provides the correct include string during customer onboarding.
How many domains use ADP?
113 domains in the Tranco top-1M use ADP as their SaaS sender as of September 14, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is ADP common enough to affect email deliverability testing?
ADP accounts for 0.02% 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 ADP most?
ADP's largest TLD is .com (77.9% of its domains); it appears across 10 TLDs in total.