Hola, ya volvi (me tome un descanso), ya desinstale el sendmail, la verdad no tengo idea de porque estaba instalado.
 
Aqui esta el resultado: 
ps aux | grep postfix
root      3814  0.0  0.3   6020   992 ?        Ss   Mar25   0:00 /usr/sbin/saslauthd -m /var/spool/postfix/var/run/saslauthd -r -a pam
root      3816  0.0  0.2   6020   592 ?        S    Mar25   0:00 /usr/sbin/saslauthd -m /var/spool/postfix/var/run/saslauthd -r -a pam
root      3817  0.0  0.2   6020   540 ?        S    Mar25   0:00 /usr/sbin/saslauthd -m /var/spool/postfix/var/run/saslauthd -r -a pam
root      3818  0.0  0.2   6020   540 ?        S    Mar25   0:00 /usr/sbin/saslauthd -m /var/spool/postfix/var/run/saslauthd -r -a pam
root      3819  0.0  0.2   6020   540 ?        S    Mar25   0:00 /usr/sbin/saslauthd -m /var/spool/postfix/var/run/saslauthd -r -a pam
root      6858  0.0  0.3   2876   796 pts/0    S+   12:03   0:00 grep postfix  
ifconfig
eth0      Link encap:Ethernet  HWaddr 00:06:29:2E:9F:7A
          inet addr:
[email protected]~2  Bcast:
[email protected]~5  Mask:255.255.0.0
          inet6 addr: fe80::206:29ff:fe2e:9f7a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:31243 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5808 errors:0 dropped:0 overruns:0 carrier:0
          collisions:36 txqueuelen:1000
          RX bytes:2682820 (2.5 MiB)  TX bytes:1405773 (1.3 MiB) 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:168 errors:0 dropped:0 overruns:0 frame:0
          TX packets:168 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:20630 (20.1 KiB)  TX bytes:20630 (20.1 KiB) 
Los cambios que hice anteriormente fueron por errores en la gateway y el broadcast.