From 5e81270b22ee6cfe6d7ead43ccbc258964cf14a7 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Mon, 22 Oct 2007 16:27:19 +0000
Subject: Issue #1307, patch by Derek Shockey. When "MAIL" is received without
 args, an exception happens instead of sending a 501 syntax error response.

---
 Lib/smtpd.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/smtpd.py b/Lib/smtpd.py
index c656ec7..4aa3476 100755
--- a/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@ -221,7 +221,7 @@ class SMTPChannel(asynchat.async_chat):
 
     def smtp_MAIL(self, arg):
         print >> DEBUGSTREAM, '===> MAIL', arg
-        address = self.__getaddr('FROM:', arg)
+        address = self.__getaddr('FROM:', arg) if arg else None
         if not address:
             self.push('501 Syntax: MAIL FROM:<address>')
             return
-- 
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