According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Fortinet FortiMail is the email service provider (ESP) for 232 domains — 0.04% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Fortinet FortiMail is a commercial email security and filtering appliance operated by Fortinet, a network security company. It is deployed as a gateway solution by organisations to handle inbound and outbound email protection, including antispam, antimalware, attachment filtering, and policy enforcement.
Fortinet's deployment footprint spans smaller and mid-market organisations rather than the largest brands, making it a common element in a diverse receiving infrastructure worldwide. This pattern means senders are likely to encounter FortiMail-protected recipients, but also that each organisation's filtering rules are independently configured — so standardised testing is less effective than direct engagement with customers who report delivery issues.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 4 | 1.7% |
| Top 100,000 | 26 | 11.2% |
| Top 1,000,000 | 179 | 77.2% |
| Unranked | 23 | 9.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 66 | 28.4% | |
| .org | 19 | 8.2% | |
| .co | 13 | 5.6% | |
| .de | 12 | 5.2% | |
| .gr | 10 | 4.3% | |
| .es | 8 | 3.4% | |
| .be | 6 | 2.6% | |
| .pt | 5 | 2.2% | |
| .com.pe | 5 | 2.2% | |
| .gov | 5 | 2.2% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 232 domains.
| Type | Service | Domains | Share of Fortinet FortiMail users |
|---|---|---|---|
| Mailbox | Unknown / Other | 195 | 84.1% |
| Mailbox | Microsoft 365 | 23 | 9.9% |
| Mailbox | Self-Hosted | 5 | 2.2% |
| Mailbox | Barracuda | 3 | 1.3% |
| Mailbox | Google Workspace | 2 | 0.9% |
| Mailbox | Hornetsecurity | 2 | 0.9% |
| ESP | Amazon SES | 18 | 7.8% |
| ESP | SendGrid (Twilio) | 17 | 7.3% |
| ESP | Mandrill | 17 | 7.3% |
| ESP | Mailchimp | 14 | 6.0% |
Fortinet FortiMail frequently appears in SPF records as an authorised outbound relay, with organisations adding its IP ranges to permit mail sent through the appliance. This is correct SPF usage for gateway deployments, but it also means the sending domain's reputation becomes partially bound to the FortiMail infrastructure's reputation. Deliverability engineers should ensure DKIM signing is preserved through the relay and that DMARC policy alignment is not disrupted by FortiMail's message processing.
See the full Fortinet FortiMail data page (KPI cards, trend, sample domains) →
Direct testing with individual Fortinet deployments is impractical because each customer's configuration is independent. Monitor real-world delivery to your audience and contact Fortinet-protected organisations directly if delivery issues occur.
232 domains in the Tranco top-1M use Fortinet FortiMail as their email service provider (ESP) as of July 13, 2026 (0.04% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Fortinet FortiMail accounts for 0.04% 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.
Fortinet FortiMail's largest TLD is .com (28.4% of its domains); it appears across 55 TLDs in total.