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I would like to create such mailing list where every contributor must sign his/her messages with PGP/GPG, otherwise mailing list software would block unsigned message.
All PGP/GPG public keys of users allowed to post should be stored somewhere on mailing list server.
All other users are allowed to read mailing list in read-only access at the same time.
To what open-source mailing list software
There's a mailing list I subscribe to where people don't see the point of moving to a web-based forum.
I, for one, am tired of seeing my mailbox filled by e-mails from that mailing list, but moving to the digest version isn't that much better because it makes replying harder than it needs to be.
As the path of lesser resistance, I'd like to recommend that admins install a web front-end to