- case ERROR: /* host name lookup failed - this can only */
- if (ignore_unknown) /* be for an incoming host (not outgoing) */
+ /* The ERROR return occurs when checking hosts, when either a forward
+ or reverse lookup has failed. It can also occur in a match_ip list if a
+ non-IP address item is encountered. The error string gives details of
+ which it was. */
+
+ case ERROR:
+ if (ignore_unknown)