diff -up exim-4.63/src/configure.default.localinterfaces exim-4.63/src/configure.default
--- exim-4.63/src/configure.default.localinterfaces	2009-10-15 16:10:42.000000000 +0200
+++ exim-4.63/src/configure.default	2009-10-15 16:57:10.000000000 +0200
@@ -165,6 +165,14 @@ daemon_smtp_ports = 25 : 465 : 587
 tls_on_connect_ports = 465
 
 
+# Specify list of interface IP addresses on which to listen. Each item
+# may optionally also specify a port. By default, Exim listens on all
+# available interfaces.
+
+# Listen only on loopback interface
+local_interfaces = <; 127.0.0.1 ; ::1
+
+
 # Specify the domain you want to be added to all unqualified addresses
 # here. An unqualified address is one that does not contain an "@" character
 # followed by a domain. For example, "caesar@rome.example" is a fully qualified