[Mailman-Users] stopping cross posting?

Julian H. Stacey jhs at berklix.com
Tue Oct 11 16:54:03 EDT 2016

Mark Sapiro wrote:
> On 10/10/2016 05:44 PM, Adam Morris wrote:
> > 
> > Not sure if I'm using the correct terminology.
> You are.
> > People send messages to a list I run as well as other lists that I have
> > nothing to do with.
> > 
> > 
> > When people reply to the message sent to other lists the replies go to
> > my list as well as the list they replied to.
> If the person replying does a reply-all and doesn't remove the lists of
> which she is not a member from the recipients.
> > Is there a way to stop this apart from asking people to only send the
> > message to one list at a time?
> Attempting to train your list members is futile[1]. What you can do is
> set Privacy options... -> Recipient filters -> max_num_recipients to 2.
> This will cause any post with 2 or more direct (To: and Cc:) recipients
> to be held and then you can reject those posts. Whether this is more or
> less burdensome than rejecting the non-member replies from the
> cross-posted lists is something only you can decide.
> Also this creates another problem. If, as we strongly recommend, your
> list doesn't munge Reply-To:, and your user's MUAs don't offer a
> reply-list option, they probably want to reply-all to list posts which
> will cause their replies to be held too.
> Bottom line: I feel your pain, but I don't have a satisfactory solution.
> [1] My experience with lists whose members are not email wonks is that
> attempts to alter member's behavior only result in their thinking you're
> a jerk and don't modify their behavior.

max_num_recipients is an an interesting option
	(not in majordomo-1.94.5_8 I used before Mailman)

Re. [1] - Yes !!  I use:
   Privacy Options > Sender Filters > generic_nonmember_action: Discard

Draconian, but stops spammers & wasters, help avoids need for list
moderators, & saves list owner time - some list members can be truly awful.

Julian Stacey, BSD Linux Unix Sys Eng Consultant Munich
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