[tlug] ipchains settings to allow sendmail from localhost

[s4565@example.com]

Hi

I am trying to set up ipchains to only allow sendmail to send/process/? mail which is sent from my local machine
127.0.0.1(The machine I am running sendmail on).  Currently the default settings from Redhat 7.2 are

[snip]
:input ACCEPT
:forward ACCEPT
:output ACCEPT
-A input -s 0/0 -d 0/0 25 -p tcp -y -j ACCEPT
[snip]

in /etc/sysconfig/ipchains

which when I run ipchains --list gives me
             
ot@example.com root]# ipchains --list
[snip]
Chain input (policy ACCEPT):
target     prot opt     source                destination           ports
ACCEPT     udp  ------  dns2.wakwak.com      anywhere              domain ->   1025:65535
ACCEPT     udp  ------  dns2.wakwak.com      anywhere              domain ->   1025:65535
ACCEPT     udp  ------  dns1.wakwak.com      anywhere              domain ->   1025:65535
ACCEPT     tcp  -y----  anywhere             anywhere              any ->   smtp
[snip]

which to me looks a bit of a worry...I am not sure I like the "any-> smtp" part, does this mean at the moment anyone
can use my machine to send email?  What I want to know is what do I need to do to both the /etc/sysconfig/ipchains file
and /etc/sendmail* files to make it so my sendmail program will only process "email send requests"(not sure of the
right term here) from my local machine 127.0.0.1
 
Cheers

Tony