According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), Watermark is the SaaS sender for 136 domains — 0.02% of 617,244 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Watermark is a SaaS platform that provides institutional communication and workflow management services, functioning as an email provider for the organisations that use it. Institutions using Watermark authorise its mail servers to send email on their behalf by including Watermark in their SPF records, thereby delegating email delivery infrastructure to Watermark's cloud platform.
Watermark's footprint is concentrated in the education sector, appearing predominantly in .edu domain authorisation records rather than across large commercial brands. It is frequently deployed alongside Microsoft 365 within educational institutions, reflecting the pattern of higher-education organisations adopting multiple cloud platforms in parallel. For senders and recipients alike, Watermark-authenticated email typically signals institutional or educational communication; for anyone managing email reputation, understanding that Watermark serves primarily smaller educational institutions rather than mainstream enterprises shapes realistic expectations for mail volume and sender behaviour patterns.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 18 | 13.2% |
| Top 1,000,000 | 113 | 83.1% |
| Unranked | 5 | 3.7% |
| TLD | Domains | Share | |
|---|---|---|---|
| .edu | 123 | 90.4% | |
| .com | 3 | 2.2% | |
| .no | 2 | 1.5% | |
| .nz | 1 | 0.7% | |
| .ar | 1 | 0.7% | |
| .za | 1 | 0.7% | |
| .us | 1 | 0.7% | |
| .kg | 1 | 0.7% | |
| .de | 1 | 0.7% | |
| .ca | 1 | 0.7% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 136 domains.
| Type | Service | Domains | Share of Watermark users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 80 | 58.8% |
| Mailbox | Google Workspace | 29 | 21.3% |
| Mailbox | Barracuda | 9 | 6.6% |
| Mailbox | Proofpoint | 4 | 2.9% |
| Mailbox | Self-Hosted | 3 | 2.2% |
| Mailbox | Unknown / Other | 3 | 2.2% |
Watermark appears in institutional SPF records as an authorised mail provider, typically via an include mechanism that delegates part of the sender authorisation to Watermark's infrastructure. This means Watermark's own sender reputation—built from the collective behaviour of its users—directly influences deliverability for each institution's outbound mail. Institutions running both Watermark and Microsoft 365 must carefully manage their SPF records to authorise both platforms without exceeding the SPF query limit, and any reputation issues in Watermark's IP space will affect institutional delivery regardless of the individual institution's sending practices.
See the full Watermark data page (KPI cards, trend, sample domains) →
Watermark is an email delivery platform used by educational institutions to send mail on their behalf; institutions add Watermark to their SPF records to authorise Watermark's servers as legitimate senders. This delegation allows institutions to leverage Watermark's infrastructure and sender reputation rather than managing their own outbound mail servers.
136 domains in the Tranco top-1M use Watermark as their SaaS sender as of July 12, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Watermark 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.
Watermark's largest TLD is .edu (90.4% of its domains); it appears across 11 TLDs in total.