Check modules

Spamexx scores every mail with several modules. Platform admins enable/disable them under Settings → Check modules (live, no restart):

• Virus check – scans every message incl. attachments for malware
• Spam content check – rule- and learning-based content scoring
• Header heuristics – anomalies in the headers
• IP reputation – sender IP checked against reputation blocklists
• In-house threat data – cross-domain spam detection
• VirusTotal – optional second opinion (add-on)

Behavior on failure

Via checker_fail_mode (Settings → External) you define what happens when an active module is unreachable:

• closed (default) – hold the mail with 451; the sender retries, never unchecked.
• virus – hold only if the virus module fails.
• open – skip and deliver anyway.