can not sending mail with exim4 in debian

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http://serverfault.com – i have installed the exim4 using aptitude install exim4 and configure with dpgk-reconfigure exim4-config this is my /etc/exim4/update-exim4.conf.conf file: dc_eximconfig_configtype='internet' dc_other_hostnames='midomain.com' dc_local_interfaces=' ; ::1' dc_readhost='' dc_relay_domains='' dc_minimaldns='false' dc_relay_nets='' dc_smarthost='' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='true' dc_mailname_in_oh='true' dc_localdelivery='maildir_home' when i exec in shell: echo "This is a test." | mail -s Testing [email protected] this does nothing. in the (HowTos)