Discovery Action sends mail twice

[Zabbix_User100]

Hello everyone,

I've a question how to deal with the following problem.

I've created a discovery rule with an ICMP Ping check. Let's call is DiscoveryRuleA
After that I created an discovery action which send an e-mail if the following conditions are true:
- Discovery Rule equals DiscoveryRuleA
- Discovery status equals UP

Now, if a new device is coming up, it will be discovered and the action is working.

The problem no is, that I get two mails from Zabbix.
One with the following content:
Discovery rule: DiscoveryRuleA Device IP: A.B.C.D Device DNS: hostname Device status: UP Device uptime: 1h 0m Device service name: *UNKNOWN* Device service port: *UNKNOWN* Device service status: *UNKNOWN* Device service uptime: *UNKNOWN* The second mail with the following content:
Discovery rule: DiscoveryRuleA Device IP: A.B.C.D Device DNS: hostname Device status: UP Device uptime: 1h 0m Device service name: ICMP ping Device service port: 0 Device service status: UP Device service uptime: 1h 0m Now, I don't understand why I get two mails with the different content? I only want one mail, is this possible?

Thanks.

Best regards