diff --git a/blocking.py b/blocking.py
index f1a253c17..cc82c9011 100644
--- a/blocking.py
+++ b/blocking.py
@@ -696,7 +696,8 @@ def _get_short_domain(domain: str) -> str:
 
 
 def is_blocked_domain(base_dir: str, domain: str,
-                      blocked_cache: [] = None) -> bool:
+                      blocked_cache: [] = None,
+                      block_federated: [] = None) -> bool:
     """Is the given domain blocked?
     """
     if '.' not in domain:
@@ -709,6 +710,10 @@ def is_blocked_domain(base_dir: str, domain: str,
 
     search_str = '*@' + domain
     if not broch_mode_is_active(base_dir):
+        if block_federated:
+            if domain in block_federated:
+                return True
+
         if blocked_cache:
             for blocked_str in blocked_cache:
                 if blocked_str == search_str:
@@ -778,7 +783,8 @@ def is_blocked_nickname(base_dir: str, nickname: str,
 
 def is_blocked(base_dir: str, nickname: str, domain: str,
                block_nickname: str, block_domain: str,
-               blocked_cache: [] = None) -> bool:
+               blocked_cache: [] = None,
+               block_federated: [] = None) -> bool:
     """Is the given account blocked?
     """
     if is_evil(block_domain):
@@ -790,6 +796,15 @@ def is_blocked(base_dir: str, nickname: str, domain: str,
 
     if not broch_mode_is_active(base_dir):
         # instance level block list
+        if block_federated:
+            for blocked_str in block_federated:
+                if '@' in blocked_str:
+                    if block_handle:
+                        if blocked_str == block_handle:
+                            return True
+                elif blocked_str == block_domain:
+                    return True
+
         if blocked_cache:
             for blocked_str in blocked_cache:
                 if block_nickname:
diff --git a/crawlers.py b/crawlers.py
index 77129a81b..708874139 100644
--- a/crawlers.py
+++ b/crawlers.py
@@ -105,6 +105,7 @@ def blocked_user_agent(calling_domain: str, agent_str: str,
                        blocked_cache_last_updated,
                        base_dir: str,
                        blocked_cache: [],
+                       block_federated: [],
                        blocked_cache_update_secs: int,
                        crawlers_allowed: [],
                        known_bots: [], path: str,
@@ -179,7 +180,8 @@ def blocked_user_agent(calling_domain: str, agent_str: str,
                                  blocked_cache_update_secs)
 
         blocked_ua = \
-            is_blocked_domain(base_dir, agent_domain, blocked_cache)
+            is_blocked_domain(base_dir, agent_domain,
+                              blocked_cache, block_federated)
         # if self.server.debug:
         if blocked_ua:
             print('BLOCK: Blocked User agent 2: ' + agent_domain)
diff --git a/daemon.py b/daemon.py
index 4fc6431ee..8643f1029 100644
--- a/daemon.py
+++ b/daemon.py
@@ -2100,7 +2100,8 @@ class PubServer(BaseHTTPRequestHandler):
         if debug:
             print('INBOX: checking for blocked domain ' + message_domain)
         if is_blocked_domain(self.server.base_dir, message_domain,
-                             self.server.blocked_cache):
+                             self.server.blocked_cache,
+                             self.server.block_federated):
             print('INBOX: POST from blocked domain ' + message_domain)
             self._400()
             self.server.postreq_busy = False
@@ -2206,6 +2207,7 @@ class PubServer(BaseHTTPRequestHandler):
                                      self.path,
                                      self.server.debug,
                                      self.server.blocked_cache,
+                                     self.server.block_federated,
                                      self.server.system_language,
                                      mitm)
         if queue_filename:
@@ -17581,6 +17583,7 @@ class PubServer(BaseHTTPRequestHandler):
                                    self.server.blocked_cache_last_updated,
                                    self.server.base_dir,
                                    self.server.blocked_cache,
+                                   self.server.block_federated,
                                    self.server.blocked_cache_update_secs,
                                    self.server.crawlers_allowed,
                                    self.server.known_bots,
@@ -23581,6 +23584,7 @@ class PubServer(BaseHTTPRequestHandler):
                                self.server.blocked_cache_last_updated,
                                self.server.base_dir,
                                self.server.blocked_cache,
+                               self.server.block_federated,
                                self.server.blocked_cache_update_secs,
                                self.server.crawlers_allowed,
                                self.server.known_bots,
diff --git a/inbox.py b/inbox.py
index d4373dbbb..595493e99 100644
--- a/inbox.py
+++ b/inbox.py
@@ -680,7 +680,9 @@ def save_post_to_inbox_queue(base_dir: str, http_prefix: str,
                              message_bytes: str,
                              http_headers: {},
                              post_path: str, debug: bool,
-                             blocked_cache: [], system_language: str,
+                             blocked_cache: [],
+                             block_federated: [],
+                             system_language: str,
                              mitm: bool) -> str:
     """Saves the given json to the inbox queue for the person
     key_id specifies the actor sending the post
@@ -753,7 +755,7 @@ def save_post_to_inbox_queue(base_dir: str, http_prefix: str,
                     get_domain_from_actor(in_reply_to)
                 if reply_domain:
                     if is_blocked_domain(base_dir, reply_domain,
-                                         blocked_cache):
+                                         blocked_cache, block_federated):
                         if debug:
                             print('WARN: post contains reply from ' +
                                   str(actor) +