Email Zeek

Respected devs,

I installed Zeek and configure interface, email, private IP address, etc.
I copied script for SSH password guessing from docs.zeekweb site and my listener on wlan0 works.
When I failed to login on SSH with Putty enough times, I never recieved alert email.
Every SSH login is in ssh.log file, but nothing on email.
Internet works on my Rassoberry pi.

Could you help me, where is the problem?

Thank you in advance,
Petar Backovic