Leak a little bit of info about why a message is rejected

It's less confusing for users if we say something like "your DNS is
broken" rather than just "message rejected".

diff --git a/modules/exim/templates/eximconf.erb b/modules/exim/templates/eximconf.erb
index 5c9f8bb287dfd80af995eccea5cfa3535f996e78..fb0da2efa7a7ad4578c73308e6673c5d453d6070 100644 (file)
--- a/modules/exim/templates/eximconf.erb
+++ b/modules/exim/templates/eximconf.erb
@@ -837,6 +837,7 @@ check_recipient:
                         ${lookup{$local_part}lsearch{/var/lib/misc/$primary_hostname/mail-callout}{$local_part}{}}
           !hosts   = +debianhosts : WHITELIST
          !verify  = sender/callout=90s,maxwait=300s
+         message  = "Sender verification failed: $acl_verify_message"
 
 <%- end -%>
 <%- if scope.lookupvar('site::nodeinfo')['mailrelay'] -%>