diff --git a/posts.py b/posts.py
index a7618ba9..1256b472 100644
--- a/posts.py
+++ b/posts.py
@@ -1012,14 +1012,18 @@ def threadSendPost(session,postJsonStr: str,federationList: [],\
     sendIntervalSec=30
     for attempt in range(20):
         postResult=None
+        unauthorized=False
         try:
-            postResult = \
+            postResult,unauthorized = \
                 postJsonString(session,postJsonStr,federationList, \
                                inboxUrl,signatureHeaderJson, \
                                "inbox:write",debug)
         except Exception as e:
-            print('ERROR: postJsonString failed')
-            print(e)
+            print('ERROR: postJsonString failed '+str(e))
+        if unauthorized==True:
+            print(postJsonStr)
+            print('threadSendPost: Post is unauthorized')
+            break
         if postResult:
             logStr='Success on try '+str(tries)+': '+postJsonStr
         else:
diff --git a/session.py b/session.py
index e16e00cd..a8e0f61b 100644
--- a/session.py
+++ b/session.py
@@ -75,9 +75,10 @@ def postJsonString(session,postJsonStr: str, \
                    inboxUrl: str, \
                    headers: {}, \
                    capability: str, \
-                   debug: bool) -> bool:
+                   debug: bool) -> (bool,bool):
     """Post a json message string to the inbox of another person
     Supplying a capability, such as "inbox:write"
+    The second boolean returned is true if the send is unauthorized
     NOTE: Here we post a string rather than the original json so that
     conversions between string and json format don't invalidate
     the message body digest of http signatures
@@ -88,7 +89,7 @@ def postJsonString(session,postJsonStr: str, \
         # check that we are posting to a permitted domain
         if not urlPermitted(inboxUrl,federationList,capability):
             print('postJson: '+inboxUrl+' not permitted by capabilities')
-            return None
+            return None,None
 
     postResult = session.post(url = inboxUrl, data = postJsonStr, headers=headers)
     if postResult.status_code<200 or postResult.status_code>202:
@@ -97,13 +98,14 @@ def postJsonString(session,postJsonStr: str, \
         #    postResult = session.post(url = inboxUrl, data = postJsonStr, headers=headers)
         #    if not (postResult.status_code<200 or postResult.status_code>202):
         #        return True
-        if postResult.status_code==401:
+        if postResult.status_code>=400 and postResult.status_code<=405:
             print('WARN: >>> Post to '+inboxUrl+' is unauthorized <<<')
+            return False,True
         else:
             print('WARN: Failed to post to '+inboxUrl+' with headers '+str(headers))
             print('status code '+str(postResult.status_code))
-        return False
-    return True
+            return False,False
+    return True,False
 
 def postImage(session,attachImageFilename: str,federationList: [],inboxUrl: str,headers: {},capability: str) -> str:
     """Post an image to the inbox of another person or outbox via c2s