[Mailman-Developers] encrypted mailing list

Hi,

I've been playing around with the idea of making software for an encrypted mailing list that would be based around GPG. Each mailing list would have its own public key. All members of a list would have to submit a public key on subscription. When incoming mail is received, the mailing list software would decrypt the email and then re-encrypt with the public key for each of the members of the list.

Has anyone played around with this idea? Has anyone already done a working concept? I was just curious, and I wanted to throw the idea out there. Thanks!

Regards, Tom