On this page

OSSEC / HIDS Rule 3351

Rule family: OSSEC / HIDS
Rule ID: 3351
Definition status: Present in current source
Alert message / subject: Postfix: Multiple relaying attempts of spam.
Rule level: 6
Definition checked: 2026-10-21
Configured frequency: $POSTFIX_FREQ
Timeframe (seconds): 90

Correlation values are configuration attributes; event-count behavior depends on the manager version and parent rules.

Interpretation and response

This event is recorded as “Postfix: Multiple relaying attempts of spam.” Review the originating log and the affected host or service to determine whether the activity was expected.

An OSSEC/HIDS event records or correlates activity. Blocking depends on the originating application and any separately configured Active Response policy; an alert alone does not prove that an attack was blocked.

Documentation

The following guidance was migrated from the historical wiki and reviewed against the rule definition. Legacy ASL product names and interface instructions refer to the versions documented then. Use the current metadata above and your installed configuration when interpreting thresholds, notification settings and response behavior.

Rule ID

3351

Status

The wiki marked this rule Active at the source revision. Current definition status is shown above.

Description

This rule detects multiple relaying attempts of spam through postfix. The default settings are to detect 6 attempts from the same IP, within 90 seconds. The IP is then blocked by default for 600 seconds.

False Positives

This rule can be falsely triggered if a user is attempting to relay mail through the system, but it not authorized to do so.

Tuning Recommendations

None.

Source and revision

Migrated from HIDS_3351, wiki page 676, revision 5729 (20160707). Documentation review: 2026-10-21. An archived wiki status of Active is not a current deployment status.

For assistance, provide the rule ID, installed product and rule version, and a sanitized event to Atomicorp support .