diff --git a/src/teams_bot/bot.py b/src/teams_bot/bot.py
index e09cb88..4e72d59 100644
--- a/src/teams_bot/bot.py
+++ b/src/teams_bot/bot.py
@@ -1,4 +1,5 @@
 import logging
+import time
 from threading import Event
 
 import pickledb
@@ -44,6 +45,25 @@ class RelayPlugin:
         if not kvstore.get("relays"):
             kvstore.set("relays", list())
 
+    @account_hookimpl
+    def ac_outgoing_message(self, message: deltachat.Message):
+        while not message.is_out_delivered():
+            time.sleep(0.1)
+            if message.is_out_failed():
+                break
+        begin = int(time.time())
+        while not message.is_out_failed():
+            time.sleep(0.1)
+            if int(time.time()) < begin + 10:
+                break  # it probably just worked.
+        else:
+            error = message.get_message_info()
+            logging.warning(
+                "Outgoing message failed. Forwarding error to relay group: %s", error
+            )
+            relay_group = self.get_relay_group(message.chat.id)
+            relay_group.send_text(f"Sending Message failed:\n\n{error}")
+
     @account_hookimpl
     def ac_incoming_message(self, message: deltachat.Message):
         """This method is called on every incoming message and decides what to do with it."""
diff --git a/tests/conftest.py b/tests/conftest.py
index ab31b84..8e65c1b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -141,7 +141,9 @@ def outsider(tmpdir):
 
 
 def account(db_path, show_ffi=False):
-    token = os.environ.get("DCC_NEW_TMP_EMAIL", "https://nine.testrun.org/cgi-bin/newemail.py")
+    token = os.environ.get(
+        "DCC_NEW_TMP_EMAIL", "https://nine.testrun.org/cgi-bin/newemail.py"
+    )
     print(token)
     ac = deltachat.Account(str(db_path))
     credentials = requests.post(token).json()
diff --git a/tests/test_bot.py b/tests/test_bot.py
index 882faab..fc3c51f 100644
--- a/tests/test_bot.py
+++ b/tests/test_bot.py
@@ -1,10 +1,14 @@
 import os.path
+import time
 
 import deltachat
 import pytest
 from deltachat.capi import lib as dclib
 
 
+TIMEOUT = 20
+
+
 @pytest.mark.timeout(60)
 def test_not_relay_groups(relaycrew, outsider):
     bot = relaycrew.bot
@@ -215,3 +219,34 @@ def test_change_avatar(relaycrew):
     confirmation_msg = user.wait_next_incoming_message()
     assert confirmation_msg.text == "Avatar changed to this image."
     assert botcontact.get_profile_image()
+
+
+def test_forward_sending_errors_to_relay_group(relaycrew):
+    usercrew = relaycrew.user.get_chats()[-1]
+    usercrew.send_text("/start_chat alice@example.org This_Message_will_fail test")
+
+    while len(relaycrew.bot.get_chats()) < 3:
+        time.sleep(0.1)
+    out_chat = relaycrew.bot.get_chats()[-1]
+    outgoing_message = out_chat.get_messages()[-1]
+    print(outgoing_message)
+    begin = int(time.time())
+    while not outgoing_message.is_out_failed() and int(time.time()) < begin + TIMEOUT:
+        time.sleep(0.1)
+    assert outgoing_message.is_out_failed()
+
+    while len(relaycrew.user.get_chats()) < 2 and int(time.time()) < begin + TIMEOUT:
+        time.sleep(0.1)
+    relay_group = relaycrew.user.get_chats()[-2]
+
+    while len(relay_group.get_messages()) < 3 and int(time.time()) < begin + TIMEOUT:
+        print(relay_group.get_messages()[-1].text)
+        time.sleep(0.1)
+    assert (
+        "Recipient address rejected: Domain example.org does not accept mail"
+        not in relay_group.get_messages()[-1].text
+    )
+    assert (
+        "Invalid unencrypted mail to <alice@example.org>"
+        in relay_group.get_messages()[-1].text
+    )