Hi,

Thank you for the response. I have found the entry you were referring to. I 
have one additional level. The email_alert_level is set to level 7, so 
email alerts will be sent for every rule matching the level 7, but the su 
rule is level 9:

  <rule id="5302" level="9">
    <if_sid>5301</if_sid>
    <user>^root</user>
    <description>User missed the password to change UID to 
root.</description>
    <group>authentication_failed,</group>
  </rule>

Therefore by setting this rule to level 7 would definitely change the 
amount of emails sent. 

But exactly how many su password failure alerts need to be sent to ossec 
for the rule to be triggered and email sent? Basically I would like to know 
where the rules for the levels are defined: how many log entries are 
required for certain level to be invoked.

Thank you

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