ZMS-185 (#33)

* fix logical error with tempfail

* fix subject issue when using api. add debugJson to gelf

* safer delete with check

* Add better SMTP error message

* make message shorter

index.js

@@ -197,6 +197,8 @@ module.exports.init = async app => {
         subject = subject.substring(0, subjectMaxLength);
         const messageIdHeaderVal = allHeadersParsed['Message-ID']?.replace('<', '').replace('>', '');
 
+        let zilterResponse;
+
         // Call Zilter with required params
         try {
             const res = await undici.request(zilterUrl, {
@@ -220,6 +222,8 @@ module.exports.init = async app => {
 
             const debugJson = { ...resBodyJson };
 
+            zilterResponse = resBodyJson;
+
             ['SENDER', 'SENDER_GROUP', 'WEBHOOK'].forEach(sym => {
                 if (debugJson.symbols) {
                     delete debugJson.symbols[sym];
@@ -312,7 +316,12 @@ module.exports.init = async app => {
 
         if (!passEmail) {
             // rejected
-            throw app.reject(envelope, 'banned', messageinfo, '550 SMTP ACCESS DENIED - ABUSE PREVENTION HAS TRIGGERED A BAN.');
+            throw app.reject(
+                envelope,
+                'banned',
+                messageinfo,
+                `550 ${zilterResponse && zilterResponse.symbols ? `SENDING BLOCKED, REASON: ${zilterResponse.symbols.REJECT_REASON}` : 'SENDING BLOCKED'}`
+            );
         }
 
         if (isTempFail) {