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Mailman - The GNU Mailing List Management System
Copyright (C) 1998-2018 by the Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
NETSCAPE ISSUES
Some of your users may experience problems sending mail to a
members-only list, if they are using Netscape Communicator as
their MUA. Communicator 4.x on Linux has been observed to insert
bogus unqualified Sender: headers -- i.e. Sender: headers with
only the username part of the email address. Other version of
Netscape may also have the same bug.
By default, members-only lists use the From: header as the first
field to authenticate against, falling back to Sender:. The site
administrator can also configure Mailman to always use Sender:
first. If Sender: is used, and it exists in the email message,
but it is unqualified, it will never match a mailing list member's
address, and their post will always be held for approval.
In the future, Mailman will improve its algorithm for finding a
matching address, but in the meantime, M. A. Lemburg <mal@lemburg.com>
provides the following advice. You can send this snippet to any user
whose posts are being held for seemingly no reason.
Edit the two .js files in your .netscape directory (liprefs.js and
preferences.js) to include the function call:
user_pref("mail.suppress_sender_header", true);
BTW, the binary includes a comment which says that this is only
necessary on Unix.
Since Communicator regenerates this file upon exit, the change
must be done when Communicator is not currently running. With the
next start, it will stop adding the Sender: header and things
start to work like a charm again.
The reason things start to work again, is that Mailman falls back to
authenticating the From: header if the Sender: header is missing,
even if the site administrator has configured things to look at
Sender: first.
MOZILLA
There are no known problems with Mozilla 0.9.x at this time. I
don't know whether the above Netscape problem also affects
Mozilla.
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