in http://www.zabbix.com/documentation/2.0/manual/config/items/itemtypes/snmptrap
written: "...All customised perl trap receivers and SNMPTT trap configuration must format the trap in the following way: [timestamp] [the trap, part 1] ZBXTRAP [address] [the trap, part 2], where

[timestamp] - timestamp used for log items
ZBXTRAP - header that indicates that a new trap starts in this line
[IP] - IP address used to find the host for this trap..."
"[address]" and "[IP]" is confused.