refactor: remove code to send messages without intended recipient fingerprint

test-data/message/alice_to_bob_no_intended_recipient_fingerprint.eml

@@ -0,0 +1,66 @@
+Content-Type: multipart/encrypted; protocol="application/pgp-encrypted";
+	boundary="189f5bdd65baabe1_1081b3a339e9a68e_ec024374690079d2"
+MIME-Version: 1.0
+From: <alice@example.org>
+To: "hidden-recipients": ;
+Subject: [...]
+Date: Wed, 18 Mar 2026 14:03:13 +0000
+Message-ID: <4bc40798-0029-42ef-b34a-77866db439a5@localhost>
+Chat-Version: 1.0
+
+
+--189f5bdd65baabe1_1081b3a339e9a68e_ec024374690079d2
+Content-Type: application/pgp-encrypted; charset="utf-8"
+Content-Description: PGP/MIME version identification
+Content-Transfer-Encoding: 7bit
+
+Version: 1
+
+--189f5bdd65baabe1_1081b3a339e9a68e_ec024374690079d2
+Content-Type: application/octet-stream; name="encrypted.asc";
+	charset="utf-8"
+Content-Description: OpenPGP encrypted message
+Content-Disposition: inline; filename="encrypted.asc";
+Content-Transfer-Encoding: 7bit
+
+-----BEGIN PGP MESSAGE-----
+
+wU4DAAAAAAAAAAASAQdA297achK/ltriEs4OZi2IH+z7qzCFohr/zIzQP56gAlUg
+M+1o/VqAjq/vo1iWluO+q7OkQZ71F3svvCb8I8bEtijBwEwDAAAAAAAAAAABB/9z
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+VEJ9Mqz+YT5A4e+3inYfrmfVdNHNmF4y
+=2p4+
+-----END PGP MESSAGE-----
+
+
+--189f5bdd65baabe1_1081b3a339e9a68e_ec024374690079d2--