From 22e4d2db60dafae9641e653222e43b6bbe44973d Mon Sep 17 00:00:00 2001
From: bwarsaw <>
Date: Thu, 22 Jan 2004 23:02:07 +0000
Subject: updated comments

---
 Mailman/Handlers/SMTPDirect.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Mailman/Handlers/SMTPDirect.py b/Mailman/Handlers/SMTPDirect.py
index 0d09d861..2a0d4c77 100644
--- a/Mailman/Handlers/SMTPDirect.py
+++ b/Mailman/Handlers/SMTPDirect.py
@@ -345,7 +345,9 @@ def bulkdeliver(mlist, msg, msgdata, envsender, failures, conn):
     # tempted to delivery bounces there instead of our envelope sender
     #
     # BAW An interpretation of RFCs 2822 and 2076 could argue for not touching
-    # the Sender header at all, and using Return-Path instead of Errors-To.
+    # the Sender header at all.  Brad Knowles points out that MTAs tend to
+    # wipe existing Return-Path headers, and old MTAs may still honor
+    # Errors-To while new ones will at worst ignore the header.
     del msg['sender']
     del msg['errors-to']
     msg['Sender'] = envsender
-- 
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