Every email the association sends also carries a one-click unsubscribe link that needs no sign-in. That is deliberate: an unsubscribe that demands a login is one people answer with the spam button instead, and that costs delivery for every address on our sending domain — not just theirs.
Some notices are delivered here and nowhere else. A message worded only as “you have a new message” is one of those: it is kept deliberately vague so that nobody glancing at your screen or your phone learns what it concerns. Open it here to read it.