Well, 2+N companies depending on what servers the people you correspond with use. That's the nature of a federated protocol.

Ha ha. Very clever spin, and it's the truth!

However ... the larger N, the weaker the argument.

Because each of the participants has only a fraction of your e-mails.

That is a fair point, amelius!

However, I won't be giving any third parties access to DarwinMail ;)