[Mailman-Users] replies going to sender when set to list?

Mark Sapiro mark at msapiro.net
Sat Jul 8 19:00:06 EDT 2017

On 07/08/2017 02:38 PM, Adam Morris wrote (off list):
> Hi Mark,
> I'm using thunderbird on windows, latest version.
> Below are the message headers for one that pressing ctrl r sends reply
> to the sender.

(returning to the list)

I would call this a bug in Tbird, but Mozilla probably calls it a
deliberate feature.[1] It may be a response to something like
<https://bugzilla.mozilla.org/show_bug.cgi?id=524277>, but that's old
and not marked fixed. So far, I haven't found anything else relevant,
but I haven't looked very hard.

Here's the story:

If a message contains a Reply-To: header and a List-Post: header, both
containing the same address, "Reply" ignores the Reply-To:. Presumably,
the theory is Tbird offers "Reply List" (shift+Ctrl+L), so if you are
using "Reply" rather than "Reply List", you must intend the reply to go
to the sender.

The only thing you can do in Mailman is set include_list_post_header to
No, but this may annoy some users who like the "Reply List" ability.

[1] It is a bug in that it is a violation of RFC 5322 sec 3.6.2 which
says in part

   The originator fields also provide the information required when
   replying to a message.  When the "Reply-To:" field is present, it
   indicates the address(es) to which the author of the message suggests
   that replies be sent.  In the absence of the "Reply-To:" field,
   replies SHOULD by default be sent to the mailbox(es) specified in the
   "From:" field unless otherwise specified by the person composing the

Of course, setting reply_goes_to_list is also a violation ...

And I'm also somewhat sympathetic to the arguments in
<https://bugzilla.mozilla.org/show_bug.cgi?id=524277>, but that asks for
an option, and as far as I can tell, this behavior is not optional, even
in the config editor.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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