diff --git a/blocking.py b/blocking.py
index acd6f061..8318eded 100644
--- a/blocking.py
+++ b/blocking.py
@@ -116,6 +116,11 @@ def isBlocked(baseDir: str,nickname: str,domain: str, \
               blockNickname: str,blockDomain: str) -> bool:
     """Is the given nickname blocked?
     """
+    # https://www.youtube.com/watch?v=5qw1hcevmdU
+    evilDomains=['gab.com','gabfed.com','spinster.xyz']
+    for concentratedEvil in evilDomains:
+        if blockDomain.endswith(concentratedEvil):
+            return True
     globalBlockingFilename=baseDir+'/accounts/blocking.txt'
     if os.path.isfile(globalBlockingFilename):
         if '*@'+blockDomain in open(globalBlockingFilename).read():
diff --git a/inbox.py b/inbox.py
index 348c595b..aca3ccf8 100644
--- a/inbox.py
+++ b/inbox.py
@@ -208,6 +208,14 @@ def savePostToInboxQueue(baseDir: str,httpPrefix: str, \
 
     if postJsonObject.get('object'):
         if isinstance(postJsonObject['object'], dict):
+            if postJsonObject['object'].get('inReplyTo'):
+                if isinstance(postJsonObject['object']['inReplyTo'], str):
+                    replyNickname=getNicknameFromActor(postJsonObject['object']['inReplyTo'])
+                    replyDomain,replyPort=getDomainFromActor(postJsonObject['object']['inReplyTo'])
+                    if replyNickname and replyDomain:
+                        if isBlocked(baseDir,nickname,domain,postNickname,postDomain):
+                            print('WARN: post contains reply from a blocked domain: '+replyDomain)
+                            return None                        
             if postJsonObject['object'].get('content'):
                 if isinstance(postJsonObject['object']['content'], str):
                     if isFiltered(baseDir,nickname,domain,postJsonObject['object']['content']):