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OSSEC / HIDS Rule 3306

OSSEC / HIDS rule catalog

  • Rule family: OSSEC / HIDS
  • Rule ID: 3306
  • Definition status: Present in current source
  • Alert message / subject: Postfix: IP Address black-listed by anti-spam (blocked).
  • Rule level: 6
  • Definition checked: 2026-10-21

Interpretation and response

This event is recorded as “Postfix: IP Address black-listed by anti-spam (blocked).” 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.

The current rule explicitly disables Active Response for this event.

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

3306

Status

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

Alert Message

Postfix: IP Address black-listed by anti-spam (blocked).

Description

This rule detects if your antispam email solution has blocked an IP address. ASL does not cause this and only reports when an antispam email solution does this. This rule does not shun the offending IP address and disabling this rule will have no effect on your antispam solution nor will it unblock the IP address.

False Positives

None. This rule does not shun the offending IP address and disabling this rule will have no effect on your antispam solution nor will it unblock the IP address.

Tuning Guidance

Contact your email antispam vendor for assistance.

Source and revision

Migrated from HIDS_3306, wiki page 649, revision 5629 (20160210). 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 .