Email doesn't get sent for triggered events

[steps]

I've recently setup a Zabbix server and a few clients. Everything has gone well, except email does not get sent for triggers.

Here are the facts:

OS: Ubuntu 10.04 (fully patched)
Zabbix Verson: 2.02
Email Server: Exim 4.71-3
PHP: 5.3.2
Triggered event: Failed web test

1. Does show as problem on Monitoring/Triggers and Monitoring/Events
2. Does not show in Administration/Notifications
3. Action is defined to Report problems to Zabbix Administrators
- default settings. I haven't modified.
4. Email server is set in Administration/Media types
- SMTP server: "127.0.0.1", SMTP helo: "localhost", SMTP email: "root"
- local Exim can send messages successfully using mail program
5. 2 users is in Zabbix administrators group
- both are Super Admins
- both have read/write to all servers and templates

I didn't see anything related in the logs on either debug 3 or 4, though it's hard to tell on 4.

[tfqzab]

hello. I am also facing this problem.
When I used zabbix 1.8 before, just using the following settings:
smtp server : 127.0.0.1
helo : localhost
smtp email: zabbix@localhost

emails were successfully sent.
But in zabbix 2.0.2, it does'nt work. I got the error messages:
wrong answer on RCPT TO [451 Temporary local problem - please try later ]

hoping I can fix it soon.