fix(catchall-header): ZMS-184 (#49)

* in case of catchall address, add custom header to read the original recipient

* make header configurable

* fix typo

config/wildduck.yaml

@@ -100,3 +100,5 @@ auth:
 
     # If a public key has fewer bits than required, then DKIM and ARC keys are considered failing by policy
     minBitLength: 1024
+
+originalRcptHeader: 'X-Zone-Original-Rcpt'

index.js

@@ -790,6 +790,12 @@ exports.real_rcpt_handler = function (next, connection, params) {
                 return hookDone(err);
             }
 
+            if (addressData.address.includes('*')) {
+                // wildcard/catchall address received email
+                const originalRcptHeaderName = plugin.cfg?.originalRcptHeader || 'X-Original-Rcpt';
+                txn.add_header(originalRcptHeaderName, address);
+            }
+
             if (addressData && addressData.targets) {
                 return plugin
                     .handle_forwarding_address(connection, address, addressData)