Dovecot wiki LMTP description

[Ron Leach]

List, we are planning a new configuration to which we'll migrate an 
existing installation shortly.  We are hoping to use Dovecot LMTP and 
have a query about the wiki entry for LMTP

http://wiki2.dovecot.org/LMTP

where it suggests this config:

service lmtp {
   inet_listener lmtp {
     address = 192.168.0.24 127.0.0.1 ::1
     port = 24
   }

Does this example mean that LMTP will only listen for input messages 
from the interface with IP address 192.168.0.24 (plus localhost)?  If 
so, I probably haven't understood how LMTP is intended to work.  Is 
there a reason why we want to limit LMTP to listening for messages 
from a specific IP on the network?  I need to understand that so that 
I replace ...24 with a suitable host interface that exists on our LAN 
(we don't have a host at 192.168.0.24).

Apologies for what must seem, to people using LMTP, a very basic 
question.  Nevertheless, I would be grateful for any clarification.

regards, Ron