Hardware requirements
| CPU | 2 CPU cores or more |
| Memory | 3 GB RAM or more |
| Disk | 10 GB for mail queue and logging |
It's recommended to allow all outgoing traffic for license, anti-spam and other modules to be fully functional.
Optimising performance
Hardware considerations
- Use fast disk systems; SAS RAID or SSD
- The more RAM the system has, the faster it becomes (thanks to disk/database caching)
- Make sure the storage disk is at least 10 GB; some optimisations (for example database checkpoint segments) depends on it
Increase overall throughput
- Run globalview() or other IP reputation service in the CONNECT or RCPT TO context
- Use CYREN's RPD instead of (or at least before) SpamAssassin, because RPD is much faster
- Instead of anti-virus engines, use DLP to block executable file extensions (even in ZIP files) using options ["stop_on_match" => true, "timeout" => 10, "recursion_limit" => 0]
- On a hardware with many, fast CPU cores SpamAssassin performance might be increased by raising antispam_sa_processes
- Many high-volume hosting providers need to disable SpamAssassin DNSBL lookups
- If you run http() frequently (possibly for queries or logging), consider using the background flag to dispatch queries in the background. If that is not possible, avoid HTTPS (if the network is already trusted), and if you need encryption, install the certificate locally on the PKI page instead of relying on the ssl_default_ca option
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