PennySignal shares one account system with ClusterSignal — there's no separate Penny login or mailing list here. If you're subscribed to PennySignal (on its own or as part of a Combo plan), manage or cancel it from your ClusterSignal account:
Manage subscription on ClusterSignal →
You can also sign in on the PennySignal site (top right) to check what your account currently has access to — Penny, Cluster, or both if you're on a Combo plan. If you believe you've received a PennySignal email in error, or have any other question, reach out at contact@clustersignal.io.
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