Marcos Chavarría Teijeiro wrote:

4. MailMan decrypt the received message and check if the sign is correct (with the stored public user public key). If the sign is correct, it sends a message to every mail-list subscripter encrypted with each user public key.

As Stephen suggests in another thread at <http://mail.python.org/pipermail/mailman-developers/2013-April/022681.html>, Mailman should resign with its own private key to verify that it has accepted the incoming post and that the post was signed by a list member

-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan