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-rw-r--r--Mailman/Handlers/SMTPDirect.py4
1 files changed, 3 insertions, 1 deletions
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