FortiMail 900G
650,000 messages/hour with full ATP, 500 email domains
- Enterprise ATP
- 650,000 msg/hr
- Email routing
- 1.3 Million msg/hr
- Email domains
- 500
The FortiMail 900G handles 1.3 Million messages per hour of email routing and 650,000 messages per hour with enterprise advanced threat protection enabled, across 500 email domains and 1,500 server-mode mailboxes.
650,000 messages an hour with ATP, 500 domains and 1,500 server-mode mailboxes with expansion to 8 TB. The mailbox figure signals the real shift: this is the first model comfortable operating as a full mail server rather than a filter in front of one. If you are only filtering, compare it against the 400F on volume alone — server mode is where the extra capability lives.
Highlights
- 650,000 messages/hour with ATP enabled
- 500 email domains, 1,500 server-mode mailboxes
- Gateway, transparent and full server deployment modes
- Outbound DLP and encryption for regulated data
Typical deployments
- Organisations running FortiMail as the mail system itself
- Large multi-domain estates with heavy inbound volume
- Environments consolidating regional mail gateways
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) | 1.3 Million |
|---|---|
| Performance enterprise ATP (msg/hr) | 650,000 |
| Email domains | 500 |
| Server mode mailboxes | 1,500 |
| Storage capacity | 2x 2 TB (8 TB max) |
Sources
- Fortinet Product Matrix (July 2026) — 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.