Zabbix won't send email alert after service is back up

[goolala]

Zabbix won't send email after service is back up. It does when service is down.

Also, on the Dashboard, showing Zabbix server is not working, but it is:
Status of Zabbix
Parameter Value Details
Zabbix server is running No localhost:10051


[root@zabbix zabbix]# netstat -ntlp | grep zabbix
tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN 4234/zabbix_agentd
tcp 0 0 192.168.3.249:10051 0.0.0.0:* LISTEN 4221/zabbix_server
tcp 0 0 :::10050 :::* LISTEN 4234/zabbix_agentd

zabbix_server is running though.

I'm running zabbix-server-1.8.7-2.el6.x86_64 on centos 6.

thanks,
Wayne