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, 19 insertions, 0 deletions

diff --git a/t/mda.t b/t/mda.t
index 99592b2d..35811ac6 100644
--- a/t/mda.t
+++ b/t/mda.t
@@ -308,6 +308,25 @@ EOF
         my $cur = `git --git-dir=$maindir diff HEAD~1..HEAD`;
         like($cur, qr/this message would not be accepted without --no-precheck/,
                 '--no-precheck delivered message anyways');
+
+        # try a message with multiple List-ID headers
+        $in = <<EOF;
+List-ID: <foo.bar>
+List-ID: <$list_id>
+Message-ID: <2lids\@example>
+Subject: two List-IDs
+From: user <user\@example.com>
+To: $addr
+Date: Fri, 02 Oct 1993 00:00:00 +0000
+
+EOF
+        ($out, $err) = ('', '');
+        IPC::Run::run([$mda], \$in, \$out, \$err);
+        is($?, 0, 'mda OK with multiple List-Id matches');
+        $cur = `git --git-dir=$maindir diff HEAD~1..HEAD`;
+        like($cur, qr/Message-ID: <2lids\@example>/,
+                'multi List-ID match delivered');
+        like($err, qr/multiple List-ID/, 'warned about multiple List-ID');
 }
 
 done_testing();