Zabbix sending too many mails

[rohit]

Hello,

I have a log item and corresponding trigger and action. Its working like a charm and I get an email for any "ERROR" string in my log file.
My trigger expression:
{box5.xxx.com:log[/my/log/file,ERROR,,1].str(ERROR)}=1

Problem:
Today morning I was greeted by Zabbix with 7k alert mails in my inbox. Zabbix generated alerts for every "ERROR: Connection refused" message in log file.
I want Zabbix to somehow check whether error messages are getting repeated in log file. How can I alter my trigger expression to do this? Pls help.

ERROR: Connection refused --> alert should be generated
ERROR: Connection refused --> no alert should be generated
ERROR: Connection refused --> no alert should be generated
ERROR: Connection refused --> no alert should be generated
ERROR: Some message --> alert should be generated
ERROR: Connection refused --> alert should be generated
ERROR: Connection refused --> no alert should be generated

Thanks,
Rohit Kalsarpe