Crescendo GiftLegacy SaaS sender
According to Live Direct Marketing's daily Tranco top-1M scan (September 16, 2026), Crescendo GiftLegacy is the SaaS sender for 153 domains — 0.02% of 634,905 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 153 domains in the Tranco top-1M use Crescendo GiftLegacy (0.02% of SPF-publishing domains).
- Snapshot date: 2026-09-16 — recomputed every day.
- Strongest TLD: .org (51.0% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: SaaS sender.
Why Crescendo GiftLegacy appears in this category
Crescendo Interactive — planned-giving fundraising.
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.
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.
Where Crescendo GiftLegacy sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 29 | 19.0% |
| Top 1,000,000 | 124 | 81.0% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .org | 78 | 51.0% | |
| .edu | 69 | 45.1% | |
| .com | 5 | 3.3% | |
| .net | 1 | 0.7% |
What Crescendo GiftLegacy users also use
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 | 86 | 56.2% |
| Mailbox | Google Workspace | 24 | 15.7% |
| Mailbox | Barracuda | 15 | 9.8% |
| Mailbox | Mimecast | 7 | 4.6% |
| Mailbox | Cisco IronPort | 6 | 3.9% |
| Mailbox | Proofpoint Essentials | 4 | 2.6% |
SPF delegation and sender reputation isolation
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) →
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Frequently asked questions
Why does Crescendo GiftLegacy appear in email authentication records?
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.
How many domains use Crescendo GiftLegacy?
153 domains in the Tranco top-1M use Crescendo GiftLegacy as their SaaS sender as of September 16, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Crescendo GiftLegacy common enough to affect email deliverability testing?
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.
Which countries or TLDs use Crescendo GiftLegacy most?
Crescendo GiftLegacy's largest TLD is .org (51.0% of its domains); it appears across 4 TLDs in total.