Index: /trunk/server/fedora/config/etc/postfix/main.cf
===================================================================
--- /trunk/server/fedora/config/etc/postfix/main.cf	(revision 2724)
+++ /trunk/server/fedora/config/etc/postfix/main.cf	(revision 2725)
@@ -38,3 +38,5 @@
 # "all" is the default, but if we do not specify it, Fedora's packaging
 # will add the wrong value here.
-inet_protocols = all
+# 21 Oct 2015: switching to ipv4 only, since our ipv6 addresses don't
+# have rDNS records
+inet_protocols = ipv4