On Wed, 26 Jul 2017, Danny B. wrote:
Pressing reply should then open a message with both addresses in the To:
It should be noted, that this actually technically means, that the sender
will receive such reply twice - once as the direct recipient sender@example.
com, once as the subscriber of the list...
There is a mailman option for this problem, too.
You can find a value for new_member_options to avoid duplicates if possible.
The Readme says:
Each member has a set of subscription options which they can use to control
how they receive messages and otherwise interact with the list. While the
members can change these settings by logging into their personal options page,
you might want to set the default for a number of the member options. You can
do that with this variable, but see also the other categories for other member
defaults you can set.
This variable presents a set of checkboxes which control the defaults for
some of the member options. Conceal the member's address specifies whether or
not the address is displayed in the list roster. Acknowledge the member's
posting controls whether or not Mailman sends an acknowledgement to a member
when they post a message to the list. Do not send a copy of a member's own post
specifies whether a member posting to the list will get a copy of their own
posting. Filter out duplicate messages to list members (if possible) specifies
whether members who are explicitly listed as a recipient of a message (e.g. via
the Cc: header) will also get a copy from Mailman.
Of course, members can always override these defaults by making changes on
their membership options page.
I tried it on my site and it works fine.
In addition you have the possibility to set "duplicates off/on" for each member
in the admin and the user web interface for mailman.