[Mailman-Users] change to ListAdmin.py to help with discarding problem messages

[Adrian Joseph]

The following change to ListAdmin.py seems to help a problem I've had in the
past with discarding some junk return mail. As far as I know (ie I've no
idea but ...) it seems harmless and works for me, YMMV.

diff ListAdmin.py ListAdmin.py.orig
160c160
<                 'sender'   : strquote(msg.GetSender()),
---
>                 'sender'   : msg.GetSender(),