FortiMail 400F
150,000 messages/hour with full ATP, 70 email domains
- Enterprise ATP
- 150,000 msg/hr
- Email routing
- 250,000 msg/hr
- Email domains
- 70
The FortiMail 400F handles 250,000 messages per hour of email routing and 150,000 messages per hour with enterprise advanced threat protection enabled, across 70 email domains and 400 server-mode mailboxes.
Five times the 200F on both throughput figures and 70 domains against 20, the domain count is often the binding constraint rather than the message rate, particularly for organisations that have grown by acquisition and carry a long tail of legacy mail domains. Count those before sizing on volume.
How to work out whether it fits
The arithmetic a datasheet leaves out. If any of it does not match your situation, that is worth a call rather than a guess.
Domain count is more often the binding constraint than volume at this tier. Seventy domains sounds generous until you inventory what an organisation has actually accumulated, old brands, acquisitions, misspelling catchers, and separate names for marketing mail. Each one consumes a slot whether it carries traffic or not. Do that inventory before sizing on messages per hour, because upgrading for domains you already owned is an avoidable conversation.
What to order alongside the FortiMail 400F
The published threat protection figure for this model is measured with IPS, application control and malware protection all running. Those arrive as a FortiGuard subscription, so the bundle you choose decides whether the hardware can reach the number you sized it on. Every bundle already includes FortiCare Premium 24x7 support.
| Bundle | What it adds | 1 yearlist price | 3 yearslist price | 5 yearslist price |
|---|---|---|---|---|
| Enterprise ProtectionENT | The broadest bundle. Everything in UTP, plus the services that cover data, SaaS posture and attack-surface visibility, plus inline zero-day malware prevention. | on quote | on quote | on quote |
| Unified Threat ProtectionUTP | The traditional mid-tier: perimeter defence covering network, file, web and email threats. Everything most sites actually switch on. | on quote | on quote | on quote |
| Advanced Threat ProtectionATP | The narrow bundle: IPS and the full malware stack including cloud sandboxing, without the web and email filtering layers. | on quote | on quote | on quote |
These are Fortinet list prices. You will not pay them.
Every quote we write is discounted from list, and how far below depends on quantity, term and whether we register the deal with Fortinet. Longer terms also price better per year, which is why three and five year bundles are usually the better buy on a device you intend to keep through a refresh cycle. Part numbers follow Fortinet’s standard bundled convention; not every model carries every combination, so we confirm the exact orderable SKU before anything is placed.
FortiMail 400F is number 2 of 5 in this family
Ranked on performance enterprise atp, the figure that separates these models. All values are Fortinet’s own and cited on each product page.
FortiMail 200F
30K msg/hr
400% less than the FortiMail 400F. Worth it only if your measured requirement genuinely fits inside it.
FortiMail 400F
150K msg/hr
5 models in this family span 30K msg/hr to 2.1M msg/hr.
FortiMail 900G
650K msg/hr
333% more headroom. Worth costing if you expect growth inside the refresh cycle, replacing early is dearer than buying up once.
Highlights
- 150,000 messages/hour with ATP enabled
- 70 email domains, 400 server-mode mailboxes
- Gateway, transparent and full server deployment modes
- Outbound DLP and encryption for regulated data
Typical deployments
- Multi-domain organisations after acquisitions
- Mid-size estates with meaningful inbound volume
- Deployments needing transparent-mode inline filtering
What this includes
Fortinet publishes no throughput table for this product; it is licensed per user, endpoint, workload or account. What follows is capability and sizing, not benchmarks.
Capacity
Measured at a 100 KB average message size with no queuing.
| Email routing (msg/hr) | 250,000 |
|---|---|
| Performance enterprise ATP (msg/hr) | 150,000 |
| Email domains | 70 |
| Server mode mailboxes | 400 |
| Storage capacity | 2x 1 TB |
Sources
- Fortinet Product Matrix (July 2026), retrieved 2026-09-01
- Fortinet Partner Portal price list, retrieved 2026-09-01
Reproduced from Fortinet published documentation and subject to change without notice. Where a figure is load-bearing for your design, ask us to confirm it in writing before you order; we will.