mda: support multiple List-ID matches

While it's not RFC2919-conformant, mail software can
theoretically set multiple List-ID headers.  Deliver to all
inboxes which match a given List-ID since that's likely the
intended.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Link: https://public-inbox.org/meta/87pniltscf.fsf@x220.int.ebiederm.org/

1 files changed, 13 insertions, 7 deletions

diff --git a/lib/PublicInbox/MDA.pm b/lib/PublicInbox/MDA.pm
index ce2c870f..b0dfac45 100644
--- a/lib/PublicInbox/MDA.pm
+++ b/lib/PublicInbox/MDA.pm
@@ -83,19 +83,25 @@ sub set_list_headers {
         }
 }
 
-# TODO: deal with multiple List-ID headers?
-sub inbox_for_list_id ($$) {
+sub inboxes_for_list_id ($$) {
         my ($klass, $config, $simple) = @_;
 
         # newer Email::Simple allows header_raw, as does Email::MIME:
-        my $list_id = $simple->can('header_raw') ?
+        my @list_ids = $simple->can('header_raw') ?
                         $simple->header_raw('List-Id') :
                         $simple->header('List-Id');
-        my $ibx;
-        if (defined $list_id && $list_id =~ /<[ \t]*(.+)?[ \t]*>/) {
-                $ibx = $config->lookup_list_id($1);
+        my @dests;
+        for my $list_id (@list_ids) {
+                $list_id =~ /<[ \t]*(.+)?[ \t]*>/ or next;
+                if (my $ibx = $config->lookup_list_id($1)) {
+                        push @dests, $ibx;
+                }
+        }
+        if (scalar(@list_ids) > 1) {
+                warn "W: multiple List-IDs in message:\n";
+                warn "W: List-ID: $_\n" for @list_ids
         }
-        $ibx;
+        \@dests;
 }
 
 1;