From Byrial:

I don't think that the match-all pattern modifier works as can be
expected from a logical point of view.

The attached patch will make it work as I expect it to work:

  - It works on all patterns which explicit or implicit use address
    lists: ~c, ~C, ~e, ~f, ~l, ~L, ~p, ~P, and ~t. (It didn't work
    with ~l before).

  - It works such that a modified pattern always match, unless there
    is at least one address in at least one of the referenced lists
    that it doesn't match.

1 files changed, 1 insertions, 1 deletions

diff --git a/send.c b/send.c
index 10dd3844..ca3fb176 100644
--- a/send.c
+++ b/send.c
@@ -724,7 +724,7 @@ void mutt_set_followup_to (ENVELOPE *e)
      it hasn't already been set */
   if (option (OPTFOLLOWUPTO) && !e->mail_followup_to)
   {
-    if (mutt_is_list_recipient (e->to) || mutt_is_list_recipient (e->cc))
+    if (mutt_is_list_recipient (0, e->to, e->cc))
     {
       /* i am a list recipient, so set the Mail-Followup-To: field so that
        * i don't end up getting multiple copies of responses to my mail