v3 trap is sent without VACM authorization.

Hey,
 
It seems that v3 traps are sent without authorization.
1) I'm using a security name which has not mapping to a group, and still
the trap is sent.
2) when opening vacm debug (flag -Dvacm), I don't see any debug output
concerning vacm when I sent trap (only usm debug).
 
Could it be that net-snmp does not authorize, outgoing traps?
 
thank,
Erez Makavy