According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), FormAssembly is the SaaS sender for 448 domains — 0.07% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 2 | 0.4% |
| Top 100,000 | 74 | 16.5% |
| Top 1,000,000 | 348 | 77.7% |
| Unranked | 24 | 5.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .org | 229 | 51.1% | |
| .com | 89 | 19.9% | |
| .edu | 63 | 14.1% | |
| .org.uk | 18 | 4.0% | |
| .au | 13 | 2.9% | |
| .ca | 11 | 2.5% | |
| .io | 3 | 0.7% | |
| .net | 3 | 0.7% | |
| .com.au | 3 | 0.7% | |
| .us | 3 | 0.7% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 448 domains.
| Type | Service | Domains | Share of FormAssembly users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 221 | 49.3% |
| Mailbox | Google Workspace | 115 | 25.7% |
| Mailbox | Mimecast | 31 | 6.9% |
| Mailbox | Barracuda | 21 | 4.7% |
| Mailbox | Proofpoint | 17 | 3.8% |
| Mailbox | Unknown / Other | 13 | 2.9% |
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) →
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.
448 domains in the Tranco top-1M use FormAssembly as their SaaS sender as of July 13, 2026 (0.07% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
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.
FormAssembly's largest TLD is .org (51.1% of its domains); it appears across 20 TLDs in total.