A discovery rule has been configured (see figure).

For some reason, only one specific host lbackup.dear.local receives an email notification every 70 minutes (see below). This behavior is not observed for other hosts. CentOS Linux release 8.1.1911 is installed on this host, I thought there might be a problem with this, but zabbix itself is installed on exactly the same OS and there is no such problem for this zabbix host.
What's wrong with this host? What could be the reason for persistent discovery mails for this host? Is there any way to disable discovery mail notifications for this host?
email post:
-----------------------------------------
Discovery rule: Local network
Device IP: 172.26.12.95
Device DNS:
Device status: UP
Device uptime: 19d 22h 9m 2s
Device service name: Zabbix agent
Device service port: 10050
Device service status: UP
Device service uptime: 19d 22h 9m 2s
For some reason, only one specific host lbackup.dear.local receives an email notification every 70 minutes (see below). This behavior is not observed for other hosts. CentOS Linux release 8.1.1911 is installed on this host, I thought there might be a problem with this, but zabbix itself is installed on exactly the same OS and there is no such problem for this zabbix host.
What's wrong with this host? What could be the reason for persistent discovery mails for this host? Is there any way to disable discovery mail notifications for this host?
email post:
-----------------------------------------
Discovery rule: Local network
Device IP: 172.26.12.95
Device DNS:
Device status: UP
Device uptime: 19d 22h 9m 2s
Device service name: Zabbix agent
Device service port: 10050
Device service status: UP
Device service uptime: 19d 22h 9m 2s