+ my $list_id = 'foo.example.com';
+ my $mid = 'list-id-delivery@example.com';
+ my $simple = Email::Simple->new(<<EOF);
+From: user <user\@example.com>
+To: You <you\@example.com>
+Cc: $addr
+Message-ID: <$mid>
+List-Id: <$list_id>
+Subject: this message will be trained as spam
+Date: Thu, 01 Jan 1970 00:00:00 +0000
+
+EOF
+ system(qw(git config --file), $pi_config, "$cfgpfx.listid", $list_id);
+ $? == 0 or die "failed to set listid $?";
+ my $in = $simple->as_string;
+ ok(run_script(['-mda'], undef, { 0 => \$in }),
+ 'mda OK with List-Id match');
+ my $path = mid2path($mid);
+ my $msg = $git->cat_file("HEAD:$path");
+ like($$msg, qr/\Q$list_id\E/, 'delivered message w/ List-ID matches');
+
+ # try a message w/o precheck
+ $simple = Email::Simple->new(<<EOF);
+To: You <you\@example.com>
+List-Id: <$list_id>
+
+this message would not be accepted without --no-precheck
+EOF
+ $in = $simple->as_string;
+ my ($out, $err) = ('', '');
+ my $rdr = { 0 => \$in, 1 => \$out, 2 => \$err };
+ ok(run_script(['-mda', '--no-precheck'], undef, $rdr),
+ 'mda OK with List-Id match and --no-precheck');
+ my $cur = $git->qx(qw(diff HEAD~1..HEAD));
+ like($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) = ('', '');
+ ok(run_script(['-mda'], undef, $rdr),
+ 'mda OK with multiple List-Id matches');
+ $cur = $git->qx(qw(diff HEAD~1..HEAD));
+ like($cur, qr/Message-ID: <2lids\@example>/,
+ 'multi List-ID match delivered');
+ like($err, qr/multiple List-ID/, 'warned about multiple List-ID');