diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 00000000..6da06937
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,16 @@
+[settings]
+line_length=99
+indent=4
+
+multi_line_output=5
+
+sections=FUTURE,STDLIB,THIRDPARTY,TELETHON,MAUTRIX,FIRSTPARTY,LOCALFOLDER
+no_lines_before=LOCALFOLDER
+default_section=FIRSTPARTY
+
+known_thirdparty=aiohttp,sqlalchemy,alembic,commonmark,ruamel.yaml,PIL,moviepy,prometheus_client,yarl,mako,pkg_resources
+known_telethon=telethon,alchemysession,cryptg
+known_mautrix=mautrix
+
+balanced_wrapping=True
+length_sort=True
diff --git a/mautrix_telegram/portal/portal_matrix.py b/mautrix_telegram/portal/portal_matrix.py
index 907c4704..6a19a037 100644
--- a/mautrix_telegram/portal/portal_matrix.py
+++ b/mautrix_telegram/portal/portal_matrix.py
@@ -124,11 +124,8 @@ class PortalMatrix(BasePortal, MautrixBasePortal, ABC):
         message = DBMessage.get_by_mxid(event_id, self.mxid, space)
         if not message:
             return
-        if self.peer_type == "channel":
-            await user.client(ReadChannelHistoryRequest(
-                channel=await self.get_input_entity(user), max_id=message.tgid))
-        else:
-            await user.client(ReadMessageHistoryRequest(peer=self.peer, max_id=message.tgid))
+        await user.client.send_read_acknowledge(self.peer, max_id=message.tgid,
+                                                clear_mentions=True)
 
     async def kick_matrix(self, user: Union['u.User', 'p.Puppet'], source: 'u.User',
                           ban: bool = False) -> None: