Nagios doesn't send any notification

[Reynier Pérez Mira]

Hi every:
I have installed and configured Nagios 3.2.0. For now I'm only check to 
servers. I want to receive e-mails when some of the services or server 
fail. For this I wrote this in the file commands.cfg under 
/usr/local/nagios/etc

define command{
         command_name    host-notify-by-email
         command_line    /usr/bin/mail -b "%b" "***** Nagios 
*****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: 
$HOSTS$
         }

define command{
         command_name    service-notify-by-email
         command_line    /usr/bin/mail -b "%b" "***** Nagios 
*****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: 
$SERVICEDESC$\nHost:$
         }

Then in the contacts.cfg file I define this section:
define contact{
         contact_name                    rperezm
         alias                           rperezm
         email                           rperezm at uci.cu
         service_notification_period     servers_hours
         host_notification_period        servers_hours
         service_notification_options    w,u,c,r
         host_notification_options       d,u,r
         service_notification_commands   notify-by-email
         host_notification_commands      host-notify-by-email
         }

My postfix is configured as Satellite so the mail is delivered to 
another Postfix but the address arrive empty. See this entry 
/var/log/mail.log:

Sep 22 10:34:14 monitoring postfix/qmgr[21860]: 30B911F58: 
from=<nagios at monitoring.prod.uci.cu>, size=786, nrcpt=1 (queue active)
Sep 22 10:34:14 monitoring postfix/cleanup[22149]: 3E6741F57: 
message-id=<20090922143414.3E6741F57 at monitoring.uci.cu>
Sep 22 10:34:14 monitoring postfix/qmgr[21860]: 3E6741F57: 
from=<nagios at monitoring.prod.uci.cu>, size=786, nrcpt=1 (queue active)
Sep 22 10:34:14 monitoring postfix/smtp[22157]: 30B911F58: to=<@b>, 
orig_to=<%b>, relay=10.128.50.1[10.128.50.1]:25, delay=0.16, 
delays=0.08/0.01/0.02/0.04, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued 
as 3D94F35F4)
Sep 22 10:34:14 monitoring postfix/qmgr[21860]: 30B911F58: removed
Sep 22 10:34:14 monitoring postfix/smtp[22164]: 3E6741F57: to=<@b>, 
orig_to=<%b>, relay=10.128.50.1[10.128.50.1]:25, delay=0.14, 
delays=0.06/0.01/0.01/0.06, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued 
as 4469F402B)
Sep 22 10:34:14 monitoring postfix/qmgr[21860]: 3E6741F57: removed

So, where is the problem?
Regards and thanks in advance

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