fix: signature learning never skips support@/info@/admin@ senders (#1773)

tests/test_sender_signature_skip_roles.py

@@ -0,0 +1,35 @@
+"""Sender-signature learning must skip role addresses like support@/info@.
+
+The skip-list compares against the email local-part (before "@"), but the
+entries were written "support@", "info@", "admin@" — which can never equal or
+prefix a local-part of "support"/"info"/"admin", so those role senders were
+NOT skipped and the LLM wasted work learning signatures from them. The entries
+must omit the "@".
+"""
+from src.builtin_actions import _SIG_SKIP_PREFIXES
+
+
+def _skipped(addr):
+    local = addr.split("@", 1)[0]
+    return any(local == p or local.startswith(p) for p in _SIG_SKIP_PREFIXES)
+
+
+def test_role_addresses_are_skipped():
+    assert _skipped("support@vendor.com")
+    assert _skipped("info@company.com")
+    assert _skipped("admin@example.org")
+
+
+def test_noreply_style_still_skipped():
+    assert _skipped("noreply@x.com")
+    assert _skipped("mailer-daemon@x.com")
+    assert _skipped("newsletter@x.com")
+
+
+def test_real_person_is_not_skipped():
+    assert not _skipped("john.smith@x.com")
+    assert not _skipped("alice@x.com")
+
+
+def test_no_skip_entry_contains_at():
+    assert all("@" not in p for p in _SIG_SKIP_PREFIXES)