What server do I need for Direct Mode?

Use a root-accessible, systemd Linux VPS or dedicated server running Ubuntu 22.04, 24.04 or 26.04 LTS, or Debian 12 or 13. You need root or sudo, outbound HTTPS, DNS control, a stable public IP and correct PTR/forward-confirmed reverse DNS. Direct delivery uses Postfix, Rspamd, ClamAV and supporting services.

Shared hosting, containers, cPanel, Plesk, DirectAdmin, other MTAs, multi-instance Postfix and unverifiable SMTP listeners are intentionally refused. Check your provider permits mail delivery before buying infrastructure.

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