reject messages if ORIGINAL_RECIPIENT is not specified

SpamAssassin doesn't seem to have this heuristic, but the lack of
the intended email address in To:/Cc: headers cannot be a good
sign (especially when this is a _public_ inbox).

1 files changed, 59 insertions, 0 deletions

diff --git a/t/recipient.t b/t/recipient.t
new file mode 100644
index 00000000..9cb1969e
--- /dev/null
+++ b/t/recipient.t
@@ -0,0 +1,59 @@
+# Copyright (C) 2014, Eric Wong <normalperson@yhbt.net> and all contributors
+# License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
+use strict;
+use warnings;
+use Test::More;
+use Email::Simple;
+use Email::Filter;
+use PublicInbox;
+
+sub do_checks {
+        my ($s) = @_;
+
+        my $f = Email::Filter->new(data => $s->as_string);
+        local %ENV;
+        delete $ENV{ORIGINAL_RECIPIENT};
+
+        ok(PublicInbox->recipient_specified($f),
+                "ORIGINAL_RECIPIENT unset is OK");
+
+        $ENV{ORIGINAL_RECIPIENT} = 'foo@example.com';
+        ok(!PublicInbox->recipient_specified($f),
+                "wrong ORIGINAL_RECIPIENT rejected");
+
+        $ENV{ORIGINAL_RECIPIENT} = 'b@example.com';
+        ok(PublicInbox->recipient_specified($f),
+                "ORIGINAL_RECIPIENT in To: is OK");
+
+        $ENV{ORIGINAL_RECIPIENT} = 'c@example.com';
+        ok(PublicInbox->recipient_specified($f),
+                "ORIGINAL_RECIPIENT in Cc: is OK");
+}
+
+{
+        do_checks(Email::Simple->create(
+                header => [
+                        From => 'a@example.com',
+                        To => 'b@example.com',
+                        Cc => 'c@example.com',
+                        'Content-Type' => 'text/plain',
+                        Subject => 'this is a subject',
+                ],
+                body => "hello world\n",
+        ));
+}
+
+{
+        do_checks(Email::Simple->create(
+                header => [
+                        From => 'a@example.com',
+                        To => 'b+plus@example.com',
+                        Cc => 'John Doe <c@example.com>',
+                        'Content-Type' => 'text/plain',
+                        Subject => 'this is a subject',
+                ],
+                body => "hello world\n",
+        ));
+}
+
+done_testing();