[Mailman-Users] accept_these_nonmembers from address encoding problem

[Kapetanakis Giannis]

Hi,

I have a problem in accept_these_nonmembers option.
The system is not recognizing sender's address cause it contains an 
iso-8859-7 encoded name inside From: header.

As a result it does not much user's email which is included in 
accept_these_nonmembers.

The From: header is like this:
From: 
=?iso-8859-7?B?1C7FLskuIMrRx9TH0ywg0NHPxcTRz9MgxS4gyuHw5fTh7dzq5/I=?=<user at example.com>

The system sees only a sender as ?.?.? instead of user at example.com

Can I force the use of envelope address instead of from address?
I've tried setting
SENDER_HEADERS = (None,)
SENDER_HEADERS = ('from',)
without any luck.

Any other option to try?

System is Centos 5 with mailman-2.1.9

Thanks in advance,

Giannis