Spam + sendmail

[Ruzicka Jiri]

Dobry den.
Mam uz nekolikrat probirany dotaz ohledne spamu a programu sendmai. V logu 
se mi objevilo neco jako :

Nov  9 11:43:47 gate sendmail[947]: fA74DjI07397: to=<bico na bico.net>, 
delay=2+06:30:00, xdelay=00:03:10, mailer=esmtp, pri=77701290, 
relay=bico.net. [216.168.226.133], dsn=4.0.0, stat=Deferred: Connection 
timed out with bico.net.

a podeobne (asi 1000x). Nekdo mailuje pres nas server. Muzete mi nekdo rict 
jak se toho zbavit (RH7.1-CZ), tak aby se dala posta posilat pouze z 
pocitacu nasi domeny (nasich IP)?

(ip jsou pozmenena)
muj /etc/acces: 

localhost.localdomain           RELAY
localhost                       RELAY
127.0.0.1                       RELAY
63.113.33.                      RELAY
.domena.cz                     RELAY

/etc/ip_allow:
62.168.42. 

/etc/name_allow:
.domena.cz