Trigger Escalation based on Item value & Actions

[g.vecchi]

Hi everybody, I'm running Zabbix 1.8.1 on Ubuntu Server 10.04.4

I want zabbix to alarm me when file "/tmp/testfile" weight growns on host A, so this is the scenario:

- item called "Testfile_Size", passive check, key=vfs.file.size[/tmp/testfile], interval 5s
- trigger called "Tgr_1" , expression={A:vfs.file.size[/tmp/testfile].last(0)}>104857600 , severity=high
- trigger called "Tgr_2" , expression={A:vfs.file.size[/tmp/testfile].last(0)}>10485760 , severity=average ,dependencies on Tgr_1
- trigger called "Tgr_3" , expression={A:vfs.file.size[/tmp/testfile].last(0)}>1048576 , severity=warning , dependencies on Tgr_1 and Tgr_2
- action called "default" , conditions: Trigger severity >= "Warning" and Trigger value = "PROBLEM" , operations: 1-0 send message to "ME"

The problem is:

- when Trg_3 is fired, Zabbix send me 1 email and keep emailing me with only 1 email
- when it passes from Trg_3 fired to Tgr_2 fired, Zabbix send me 2 email and keep emailing me with 2 emails
- when it passes from Trg_2 fired to Tgr_1 fired, Zabbix send me 3 email and keep emailing me with 3 emails

Any ideas how to get notified with only 1 email?

Thx