add alternative to mail providers
I am proposing to add a feature to use the mixmaster network to send mails without need for registration. User clicks a send anonymous mail button, can enter recipient, sender, subject and text and press send.
Please refer to mixmaster as a tool to send mails and discard the anonymity aspects.   Needless to say, I suggest using mixmaster over Tor.
Although the network is quite old and small, the remaining node operators are active on the remops list and not looking like they are about to shut down the network. There are even some new developments on github (mixfaster).
I've been experimenting with the mixmaster remailer network. It works reliable. Sending a mail takes approximately 5 to 30 minutes, when using a one hop mixmaster node.
Anonymity would be provided by Tor and mixmaster would gladly deliver mail. I think this is quite interesting, since it doesn't require mail providers or registration.
Mixmaster supports also posting messages to Usenet Newsgroups.
Users who wish this, could alternatively receive their messages in alt.anonymous.messages (or another group of their choice), which is also less dependent on a single e-mail address. It's like a big shared inbox, where no troll can delete other peoples messages or change their account password.
This has the advantage, that no single mail provider can log when someone pseudonym checked an account. This is because users can fetch the whole newsgroup instead of single messages so no servers know which message was belongs to whom. Doing it right, no observer can find out who communicates with whom and when.
,,  In theory, remailers or to be more concrete, high latency networks are more secure than low latency networks like Tor. The anonymity provided by the remailer would add up to the anonymity provided by Tor. Given the facts, the there is almost no activity activity (press, blog posts, forum, mailing list discussion, development ceased) it's easy to assume that remailers have very few remaining servers and users and add not much anonymity in practice.  Recommend reading: http://email@example.com/msg00022.html