I don't understand the problem: mozilla is basically saying "we need to track you, otherwise gmail/yahoo/hotmail thinks we are sending spam". But if that's the case, isn't the problem the to aggressive spam filtering of gmail/yahoo/hotmail? _Or_ mozilla is really sending spam. But knowing them I don't think that's the case.

So the real problem here is that everyone is using gmail/yahoo/hotmail, and those providers have broken spam filters. They should fix them.