eximconf: more comments

Signed-off-by: Adam D. Barratt <adam@adam-barratt.org.uk>

diff --git a/modules/exim/templates/eximconf.erb b/modules/exim/templates/eximconf.erb
index f96e4d2..6dc0a59 100644 (file)
--- a/modules/exim/templates/eximconf.erb
+++ b/modules/exim/templates/eximconf.erb
@@ -450,14 +450,17 @@ check_helo:
   # These are in HELO acl so that they are only run once.  They increment a counter,
   # so we don't want it to increment per rcpt to.
 
+  # high trust
   warn    dnslists       = list.dnswl.org&0.0.0.3
           log_message    = Hit on list.dnswl.org for $sender_host_address
           set acl_c_scr  = ${eval:$acl_c_scr-30}
 
+  # >= medium trust
   warn    dnslists       = list.dnswl.org&0.0.0.2
           log_message    = Hit on list.dnswl.org for $sender_host_address
           set acl_c_scr  = ${eval:$acl_c_scr-20}
 
+  # any form of listing
   warn    dnslists       = list.dnswl.org
           log_message    = Hit on list.dnswl.org for $sender_host_address
           set acl_c_scr  = ${eval:$acl_c_scr-10}
@@ -470,15 +473,18 @@ check_helo:
           condition      = ${if eq{$host_lookup_failed}{1}}
           set acl_c_scr  = ${eval:$acl_c_scr+20}
 
+  # HELO looks like a dynamic address (with RDNS match)
   warn    !hosts         = +debianhosts
           condition      = ${if eq{$host_lookup_failed}{0}}
           condition      = ${if match{$sender_host_name}{\N(^[^\.]*[0-9]\-+[0-9]|^[^\.]*[0-9]{5,}[^\.]|^([^\.]+\.)?[0-9][^ \.]*\.[^\.]+\..+\.[a-z]|^[^\.]*[0-9]\.[^\.]*[0-9]-[0-9]|^(dyn|cable|dhcp|dialup|ppp|adsl)[^\.]*[0-9])\N}}
           set acl_c_scr  = ${eval:$acl_c_scr+20}
 
+  # HELO looks like a dynamic address
   warn    !hosts         = +debianhosts
           condition      = ${if match{$sender_helo_name}{\N(^[^\.]*[0-9]\-+[0-9]|^[^\.]*[0-9]{5,}[^\.]|^([^\.]+\.)?[0-9][^ \.]*\.[^\.]+\..+\.[a-z]|^[^\.]*[0-9]\.[^\.]*[0-9]-[0-9]|^(dyn|cable|dhcp|dialup|ppp|adsl)[^\.]*[0-9])\N}}
           set acl_c_scr  = ${eval:$acl_c_scr+20}
 
+  # mail from a dynamic IP address range
   warn    !hosts         = +debianhosts
           dnslists       = dul.dnsbl.sorbs.net
           set acl_c_scr  = ${eval:$acl_c_scr+15}