According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Crescendo GiftLegacy is the SaaS sender for 153 domains — 0.02% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Crescendo GiftLegacy is a software-as-a-service platform that sends email on behalf of customer domains, typically smaller organisations in the non-profit sector. The service integrates into sender infrastructure via SPF include mechanisms, allowing customer domains to delegate email authentication to Crescendo's servers.
The presence of Crescendo in a domain's SPF record signals a niche but persistent email service, most commonly found alongside Microsoft 365 deployments in the .org namespace. Understanding its role in authentication is relevant for anyone evaluating sender reputation, mail-flow architecture, or testing email deliverability across diverse platform combinations.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 30 | 19.6% |
| Top 1,000,000 | 115 | 75.2% |
| Unranked | 8 | 5.2% |
| TLD | Domains | Share | |
|---|---|---|---|
| .org | 78 | 51.0% | |
| .edu | 69 | 45.1% | |
| .com | 5 | 3.3% | |
| .net | 1 | 0.7% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 153 domains.
| Type | Service | Domains | Share of Crescendo GiftLegacy users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 88 | 57.5% |
| Mailbox | Google Workspace | 22 | 14.4% |
| Mailbox | Barracuda | 13 | 8.5% |
| Mailbox | Mimecast | 8 | 5.2% |
| Mailbox | Cisco IronPort | 6 | 3.9% |
| Mailbox | Proofpoint | 5 | 3.3% |
Because Crescendo GiftLegacy customers delegate authentication via SPF includes, their sending reputation is partly insulated from the service's broader infrastructure reputation. A receiver inspecting the SPF record will see the customer domain as the sender, with Crescendo's servers authorised to send on its behalf. This design means individual customer domains retain distinct reputation profiles, rather than all Crescendo traffic pooling under a single shared IP space, a factor that matters when assessing mail flow from .org entities that also run Microsoft 365 for general communication.
See the full Crescendo GiftLegacy data page (KPI cards, trend, sample domains) →
Crescendo GiftLegacy is an email service provider that smaller organisations use to send mail on behalf of their domains; it appears in SPF records as an authorised mail handler, allowing customer domains to delegate outbound sending to its infrastructure.
153 domains in the Tranco top-1M use Crescendo GiftLegacy as their SaaS sender as of July 13, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Crescendo GiftLegacy 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.
Crescendo GiftLegacy's largest TLD is .org (51.0% of its domains); it appears across 4 TLDs in total.