Exim4 on Debian 5.0.4 error 550 relay not permitted

[little_oak]

Hi, my server is crazy!

Check log on tail -n 100 /var/log/exim4/mainlog:

2010-03-10 11:54:53 H=(littleoak) [201.58.167.197] F=<newsletter@news.domain.com> rejected RCPT <whilelive@gmail.com>: relay not permitted

My conf is:

dc_eximconfig_configtype='internet'
dc_other_hostnames='hostnameserver.domain.com;news .domain.com;localhost'
dc_local_interfaces='127.0.0.1;PUBLIC_MAIN_IP;SECO NDARY_PUBLIC_IP'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='true'
dc_relay_nets=''
dc_smarthost=''
CFILEMODE='644'
dc_use_split_config='true'
dc_hide_mailname=''
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'

---
On /etc/aliases have:

newsletter: newsletter@news.domain.com

and /etc/passwd.client i have:

news.domain.com:newsletter:securitypass

I don't understand this error.
I need send messages to external domains.

Public main e secondary ips are publics real ips.

How to solve it?
Thanks.