From cb0f9f906600f4f6e0ac09dab088181b3aba54c2 Mon Sep 17 00:00:00 2001
From: Fiete Minge <fietensen@gmail.com>
Date: Wed, 19 Mar 2025 15:10:50 +0100
Subject: [PATCH] change mechanism to upper

---
 aiosmtpd/smtp.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aiosmtpd/smtp.py b/aiosmtpd/smtp.py
index 3b85fcfb..3e73d0e8 100644
--- a/aiosmtpd/smtp.py
+++ b/aiosmtpd/smtp.py
@@ -963,7 +963,7 @@ async def smtp_AUTH(self, arg: str) -> None:
             await self.push('501 Too many values')
             return
 
-        mechanism = args[0]
+        mechanism = args[0].upper()
         if mechanism not in self._auth_methods:
             await self.push('504 5.5.4 Unrecognized authentication type')
             return