FormAssembly SaaS sender
According to Live Direct Marketing's daily Tranco top-1M scan (September 7, 2026), FormAssembly is the SaaS sender for 440 domains — 0.07% of 632,414 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 440 domains in the Tranco top-1M use FormAssembly (0.07% of SPF-publishing domains).
- Snapshot date: 2026-09-07 — recomputed every day.
- 30-day share change: +-0.00 pp.
- Strongest TLD: .org (51.6% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: SaaS sender.
Why FormAssembly appears in this category
FormAssembly — enterprise web-form and data-collection platform with strong Salesforce integration.
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.
FormAssembly is a form and survey platform that handles email delivery on behalf of customer domains, including transactional confirmations and automated notifications. When organisations use FormAssembly to collect data or run workflows, the platform sends messages in the originating domain's name, requiring an SPF record entry to authorise this mail.
In email infrastructure, FormAssembly's footprint skews toward non-profit organisations and smaller-to-mid-market sites rather than large enterprises. It frequently appears alongside Microsoft 365 in SPF records, indicating mixed cloud-infrastructure environments common in the non-profit and public-sector space. For senders and administrators, this pattern signals that FormAssembly represents a routine third-party infrastructure component—but the domain should audit whether the platform is still actively sending mail and ensure that its DMARC policy accounts for this additional authorised sender.
Where FormAssembly sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 2 | 0.5% |
| Top 100,000 | 67 | 15.2% |
| Top 1,000,000 | 370 | 84.1% |
| Unranked | 1 | 0.2% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .org | 227 | 51.6% | |
| .com | 83 | 18.9% | |
| .edu | 64 | 14.5% | |
| .org.uk | 18 | 4.1% | |
| .au | 13 | 3.0% | |
| .ca | 12 | 2.7% | |
| .us | 3 | 0.7% | |
| .com.au | 3 | 0.7% | |
| .net | 3 | 0.7% | |
| .co.uk | 3 | 0.7% |
What FormAssembly users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 440 domains.
| Type | Service | Domains | Share of FormAssembly users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 220 | 50.0% |
| Mailbox | Google Workspace | 110 | 25.0% |
| Mailbox | Mimecast | 32 | 7.3% |
| Mailbox | Barracuda | 18 | 4.1% |
| Mailbox | Proofpoint | 15 | 3.4% |
| Mailbox | Unknown / Other | 14 | 3.2% |
SPF fragmentation and auditing delegated infrastructure
Every form platform, survey tool, CRM, or marketing system added to an SPF record fragments outbound mail authentication and distributes reputation across multiple infrastructure providers. FormAssembly's concentrated presence in the .org sector means many non-profits inadvertently authorise email from a secondary platform without explicit ongoing governance. Email receivers trust the SPF authorisation, but senders should verify whether FormAssembly is still actively delivering mail on their behalf. A weak or missing DMARC policy leaves the domain vulnerable to spoofing through any of these included third parties, since SPF alone does not prevent an attacker from using an authorised infrastructure partner's identity to forge the From address.
See the full FormAssembly data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is FormAssembly and why does it appear in my SPF record?
FormAssembly is a SaaS form and survey platform that sends email notifications on behalf of organisations using it. If it appears in your SPF record, a previous administrator authorised it to send mail in your domain's name; remove the entry from your SPF record if you no longer use the platform.
How many domains use FormAssembly?
440 domains in the Tranco top-1M use FormAssembly as their SaaS sender as of September 7, 2026 (0.07% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is FormAssembly common enough to affect email deliverability testing?
FormAssembly accounts for 0.07% 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 FormAssembly growing or declining?
FormAssembly has been stable — its share moved +-0.00 pp over the last 30 days (as of September 7, 2026).
Which countries or TLDs use FormAssembly most?
FormAssembly's largest TLD is .org (51.6% of its domains); it appears across 17 TLDs in total.