diff --git a/stdplugins/superblock.py b/stdplugins/superblock.py
new file mode 100644
index 0000000..a85935f
--- /dev/null
+++ b/stdplugins/superblock.py
@@ -0,0 +1,58 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import asyncio
+
+from telethon import events
+import telethon.tl.functions as tlf
+from telethon.tl.types import InputPeerChannel, UpdateUserBlocked
+from telethon.tl.functions.contacts import GetBlockedRequest
+
+
+# How often to fetch the full list of blocked users
+REFETCH_TIME = 60
+
+blocked_user_ids = set()
+
+
+@borg.on(events.NewMessage(incoming=True, func=lambda e: e.message.mentioned))
+async def on_mentioned(event):
+    if not event.message.from_id:  # Channel messages don't have a from_id
+        return
+    if event.from_id not in blocked_user_ids:
+        return
+
+    peer = await borg.get_input_entity(event.chat_id)
+    if isinstance(peer, InputPeerChannel):
+        o = tlf.channels.ReadMessageContentsRequest(peer, [event.message.id])
+    else:
+        o = tlf.messages.ReadMessageContentsRequest([event.message.id])
+    await borg(o)
+
+
+@borg.on(events.Raw(types=UpdateUserBlocked))
+async def on_blocked(event):
+    if event.blocked:
+        blocked_user_ids.add(event.user_id)
+    else:
+        blocked_user_ids.discard(event.user_id)
+
+
+async def fetch_blocked_users():
+    global blocked_user_ids
+    while 1:
+        offset = 0
+        blocked_ids = set()
+        while 1:
+            blocked = await borg(GetBlockedRequest(offset=offset, limit=100))
+            offset += 100
+            for contact in blocked.blocked:
+                blocked_ids.add(contact.user_id)
+            if not blocked.blocked:
+                break
+        blocked_user_ids = blocked_ids
+        await asyncio.sleep(REFETCH_TIME)
+
+
+asyncio.ensure_future(fetch_blocked_users())