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Alerts not send by email :(
Make sure that all parameters for SMTP (email) server have correct values. Also, check zabbix_suckerd's log file for any error or warning messages.
zabbix_suckerd:
Error receiving initial string from SMTP server.
Error sending alert ID [1668]
The message means that ZABBIX has succesfully connected to a SMTP server, but the SMTP server didn't send welcome string back within 10 (hardcoded) seconds.
Try to telnet smptp_server 25 to see what's wrong. I think the SMTP server spends too much time doing reverse DNS lookup for incoming connections.