According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Zix SMB Hosted is the email service provider (ESP) for 101 domains — 0.02% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Zix SMB Hosted is an email hosting and management service operated by Zix Corporation, now part of the OpenText portfolio. It provides hosted email infrastructure, DNS and authentication management, and supplementary email services such as encryption and archival for small-to-medium businesses.
Zix's operational footprint is concentrated in the long tail of smaller organisations within the .com namespace, and it frequently appears alongside Microsoft 365 in sender authentication records. For email professionals, this means that Zix SPF includes are commonly encountered during deliverability audits and infrastructure reviews, particularly when investigating how smaller organisations handle multi-service email deployments.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 6 | 5.9% |
| Top 1,000,000 | 86 | 85.1% |
| Unranked | 9 | 8.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 64 | 63.4% | |
| .org | 19 | 18.8% | |
| .gov | 6 | 5.9% | |
| .edu | 4 | 4.0% | |
| .net | 3 | 3.0% | |
| .bank | 2 | 2.0% | |
| .ca | 1 | 1.0% | |
| .cl | 1 | 1.0% | |
| .us | 1 | 1.0% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 101 domains.
| Type | Service | Domains | Share of Zix SMB Hosted users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 34 | 33.7% |
| Mailbox | Google Workspace | 20 | 19.8% |
| Mailbox | Unknown / Other | 15 | 14.9% |
| Mailbox | Mimecast | 10 | 9.9% |
| Mailbox | Proofpoint | 7 | 6.9% |
| Mailbox | Barracuda | 6 | 5.9% |
| ESP | SendGrid (Twilio) | 16 | 15.8% |
| ESP | Salesforce | 12 | 11.9% |
| ESP | HubSpot | 12 | 11.9% |
| ESP | Mailchimp | 11 | 10.9% |
When Zix SMB Hosted is deployed alongside Microsoft 365, both services require separate SPF includes in the organisation's authentication records. This co-deployment is common when Microsoft 365 handles primary email delivery whilst Zix manages supplementary services such as encryption or message archival. For deliverability teams, this multi-service setup requires careful DNS validation and coordination: authentication policies from both providers must not conflict, and mail-routing configurations from each service must be understood when troubleshooting delivery issues.
See the full Zix SMB Hosted data page (KPI cards, trend, sample domains) →
Zix SMB Hosted is an email hosting and management service commonly used by smaller organisations, often deployed alongside Microsoft 365. When you encounter Zix SPF includes during email audits, it indicates the organisation is using Zix for services such as email encryption or message archival, which can affect how mail is authenticated and routed.
101 domains in the Tranco top-1M use Zix SMB Hosted as their email service provider (ESP) as of July 13, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Zix SMB Hosted 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.
Zix SMB Hosted's largest TLD is .com (63.4% of its domains); it appears across 9 TLDs in total.