Simple checks - smtp not working on zabbix 3.0.8

[ygopal17]

any idea why smtp simple check not working only for smtp on zabbix 3.0.8. have created a new item for simplecheck for - net.tcp.service[smtp,ip,25] but the last value it shows as Down (0). telnet is working fine from zabbix server to smtp server. any help will be really appreciated.

[guiip]

Hey everybody,

I would like to know if there a tutorial about how to configure a server Zabbix 3.0 with Simple Check. I saw some tutorials but for older versions and some things changed.

Grateful now.

[wild_li]

how to use zabbix 2.0 monitor service port(use simple check)

monitor tcp port 3389
in zabbix 1.8,use simple check:
key: tcp,3389

but in zabbix 2.0 simple check only five Standard items
icmppingloss[<ip>,<count>,<interval>,<size>,<timeout>]...