According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Microsoft Dynamics 365 is the SaaS sender for 210 domains — 0.03% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Microsoft Dynamics 365 is Microsoft's cloud-based customer relationship management (CRM) and enterprise resource planning (ERP) platform. It sends transactional and marketing email on behalf of customer organisations across their own domains, and is operated by Microsoft as part of its broader 365 ecosystem.
Dynamics 365 appears most often in the mid-market and smaller enterprise segment rather than among the largest global brands. Its footprint is international and skews heavily toward .com domains, with particularly high adoption in regions using Microsoft 365 for their productivity suite. This concentration means deliverability practitioners are more likely to encounter it in second- and third-tier sender populations than at the very top of the domain hierarchy.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 3 | 1.4% |
| Top 100,000 | 26 | 12.4% |
| Top 1,000,000 | 170 | 81.0% |
| Unranked | 11 | 5.2% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 84 | 40.0% | |
| .org | 14 | 6.7% | |
| .de | 12 | 5.7% | |
| .nl | 10 | 4.8% | |
| .com.au | 7 | 3.3% | |
| .se | 6 | 2.9% | |
| .ch | 6 | 2.9% | |
| .no | 5 | 2.4% | |
| .org.uk | 5 | 2.4% | |
| .eu | 5 | 2.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 210 domains.
| Type | Service | Domains | Share of Microsoft Dynamics 365 users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 132 | 62.9% |
| Mailbox | Mimecast | 19 | 9.0% |
| Mailbox | Unknown / Other | 13 | 6.2% |
| Mailbox | Proofpoint | 13 | 6.2% |
| Mailbox | Self-Hosted | 7 | 3.3% |
| Mailbox | Barracuda | 6 | 2.9% |
Organisations using Dynamics 365 declare it in their SPF records via an include: mechanism pointing to Microsoft's nameservers. Because Dynamics 365 sends from Microsoft-owned IP space, inbox providers must resolve and validate SPF queries against this delegation chain on every inbound message. Misconfiguration or removal of the Dynamics 365 include will cause authentication to fail, and senders must ensure their SPF records remain complete and accurate when the platform is in use.
See the full Microsoft Dynamics 365 data page (KPI cards, trend, sample domains) →
If your organisation uses Dynamics 365 to send email, you should verify that your SPF records correctly include Dynamics 365's configuration. However, Dynamics 365 is not an inbox provider itself, so you do not need to test final inbox placement against it the way you would test against major mailbox providers.
210 domains in the Tranco top-1M use Microsoft Dynamics 365 as their SaaS sender as of July 13, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Microsoft Dynamics 365 accounts for 0.03% 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.
Microsoft Dynamics 365's largest TLD is .com (40.0% of its domains); it appears across 39 TLDs in total.