According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Ex Libris is the SaaS sender for 300 domains — 0.05% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Ex Libris is a cloud-based email platform that organisations use to send messages on behalf of their domains. It operates as a managed email service, with its presence in email infrastructure typically visible through SPF authentication records.
The service is distributed across smaller and mid-sized organisations rather than concentrated among the largest enterprise brands. Its adoption is particularly strong in the educational sector (.edu domains and international equivalents) and frequently occurs alongside Microsoft 365 deployments, suggesting a role as an auxiliary or specialist email layer within institutions that have already standardised on Microsoft. This pattern has implications for email senders sharing infrastructure with Ex Libris customers and for recipients whose email policies must account for multiple authentication layers and service integrations.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 5 | 1.7% |
| Top 100,000 | 101 | 33.7% |
| Top 1,000,000 | 188 | 62.7% |
| Unranked | 6 | 2.0% |
| TLD | Domains | Share | |
|---|---|---|---|
| .edu | 97 | 32.3% | |
| .at | 22 | 7.3% | |
| .no | 21 | 7.0% | |
| .ac.uk | 17 | 5.7% | |
| .fr | 14 | 4.7% | |
| .de | 13 | 4.3% | |
| .org | 11 | 3.7% | |
| .ca | 8 | 2.7% | |
| .pl | 7 | 2.3% | |
| .se | 7 | 2.3% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 300 domains.
| Type | Service | Domains | Share of Ex Libris users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 192 | 64.0% |
| Mailbox | Google Workspace | 36 | 12.0% |
| Mailbox | Self-Hosted | 24 | 8.0% |
| Mailbox | Unknown / Other | 16 | 5.3% |
| Mailbox | RENATER (FR academic) | 9 | 3.0% |
| Mailbox | Barracuda | 7 | 2.3% |
Organisations that use Ex Libris alongside Microsoft 365 must carefully manage their SPF configuration to include both platforms' sending infrastructure. Because Ex Libris sits in the long tail of services—not among the largest, highest-reputation mailers—deliverability depends heavily on proper SPF setup and DMARC alignment to ensure that mail sourced from Ex Libris inherits the organisation's domain reputation without dilution. When SPF records are misconfigured or exceed DNS lookup limits, messages from Ex Libris may fail authentication or be rejected outright.
See the full Ex Libris data page (KPI cards, trend, sample domains) →
Ex Libris is a managed email service that sends messages on behalf of customer domains, commonly found in educational institutions and smaller organisations, particularly when used alongside Microsoft 365. It is identified in email authentication records (SPF) as an authorised sending platform for those domains.
300 domains in the Tranco top-1M use Ex Libris as their SaaS sender as of July 13, 2026 (0.05% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Ex Libris accounts for 0.05% 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.
Ex Libris's largest TLD is .edu (32.3% of its domains); it appears across 48 TLDs in total.