configure.default handle IPv6 localhost better.

Base patch by Alain Williams.
Tweaked, to avoid putting an IPv6-dependency into the default
uncommented form, and some rewording.

Bugzilla 880.
GitHub PR #1.

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index e309317afbcd7638966f5f7207eef4852532535c..c8155aa5c8bcf860b0830c9b49473f83e51b9c1e 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -171,6 +171,10 @@ JH/14 SMTP PRDR (http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt).
 PP/16 Fix problems caused by timeouts during quit ACLs trying to double
       fclose().  Diagnosis by Todd Lyons.
 
+PP/17 Update configure.default to handle IPv6 localhost better.
+      Patch by Alain Williams (plus minor tweaks).
+      Bugzilla 880.
+
 
 Exim version 4.80.1
 -------------------

diff --git a/src/src/configure.default b/src/src/configure.default
index 792b3ecc1b850a288e6a28257d7cf86abbf40b67..12743499cf2f6247e5760060d6a444425ded8923 100644 (file)
--- a/src/src/configure.default
+++ b/src/src/configure.default
@@ -56,7 +56,9 @@
 
 domainlist local_domains = @
 domainlist relay_to_domains =
-hostlist   relay_from_hosts = 127.0.0.1
+hostlist   relay_from_hosts = localhost
+# (We rely upon hostname resolution working for localhost, because the default
+# uncommented configuration needs to work in IPv4-only environments.)
 
 # Most straightforward access control requirements can be obtained by
 # appropriate settings of the above options. In more complicated situations,
@@ -91,12 +93,13 @@ hostlist   relay_from_hosts = 127.0.0.1
 # to any other host on the Internet. Such a setting commonly refers to a
 # complete local network as well as the localhost. For example:
 #
-# hostlist relay_from_hosts = 127.0.0.1 : 192.168.0.0/16
+# hostlist relay_from_hosts = <; 127.0.0.1 ; ::1 ; 192.168.0.0/16
 #
 # The "/16" is a bit mask (CIDR notation), not a number of hosts. Note that you
 # have to include 127.0.0.1 if you want to allow processes on your host to send
 # SMTP mail by using the loopback address. A number of MUAs use this method of
-# sending mail.
+# sending mail.  Often, connections are made to "localhost", which might be ::1
+# on IPv6-enabled hosts.  Do not forget CIDR for your IPv6 networks.
 
 # All three of these lists may contain many different kinds of item, including
 # wildcarded names, regular expressions, and file lookups. See the reference
@@ -539,6 +542,8 @@ dnslookup:
   domains = ! +local_domains
   transport = remote_smtp
   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
+# if ipv6-enabled then instead use:
+# ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
   no_more
 
 
@@ -553,7 +558,7 @@ dnslookup:
 #   domains = ! +local_domains
 #   transport = remote_smtp
 #   route_data = MAIL.HOSTNAME.FOR.CENTRAL.SERVER.EXAMPLE
-#   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
+#   ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
 #   no_more