I don’t think this information has been disseminated very widely, so:
According to the list’s main page at the UPenn website, the list is (at least temporarily) dead:
Due to technical and administrative difficulties, we can no longer offer mass mailing functionality. Submissions will appear only in the archives, sorted by category.
It will take about 24 hours for the submissions to appear in the archives.
Please do not email anything to email@example.com. Messages will be silently dropped. For the time being, subscriptions to the list have been halted. We hope to recreate the original CFP list functionality in the near future. Alerts will be posted here and sent out through the mailing list.
So, right now it’s web-only.