We take messages about exceeds the maximum size of packet like this:
25341:20130730:012646.659 Message size 137312463 exceeds the maximum size 134217728 bytes. Message ignored.
25341:20130730:012646.659 Error while receiving answer from server []

There is not possible to understand what host is generated so much information. Would be great add host related information to message, like this:
25341:20130730:012646.659 Zabbix took a message from [Proxy name/agent name/unknown sender] with [IP]. The message size 137312463 exceeds the maximum size 134217728 bytes. Message ignored.