Fix waiting for the wrong future type

punkow/service/mailer.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import asyncio
 import concurrent.futures
 import dataclasses
+import functools
 import logging
 import os
 import smtplib
@@ -107,7 +108,8 @@ class AsyncMailQueue(object):
 
     async def __aexit__(self, exc_type, exc_val, exc_tb):
         if len(self._queue) != 0:
-            await asyncio.gather(*self._queue)
+            await self._loop.run_in_executor(None, functools.partial(
+                concurrent.futures.wait(self._queue)))
 
     def _append_task(self, coro):
         self._queue.append(asyncio.run_coroutine_threadsafe(coro, self._loop))