We're going to be enabling a whole new crop of technology on Radix pretty soon that will authenticate the origin of our email messages to that people we send email to can have assurance that you really did send a message that claims to be from you. This is an evolving feature in the email network that will help us combat spoofing of domains by spammers and help us ensure reliable delivery of messages from people we communicate with on a regular basis.
In order to make this happen though, some old behaviors have to change. In particular, we need to make sure that all mail that is legitimately sent from a domain routes through the specified mail servers for that domain. This means that users who are sending messages through their ISPs mail systems or their work mail systems, but using your personal address @cryptio.net (or others) will need to change to delivering mail through Radix itself.
If you only ever use SquirrelMail (web mail) or log directly in to Radix to email through Pine or Mutt, you have nothing to worry about. If you use a desktop email client such as Outlook, Netscape/Mozilla/Thunderbird, Eudora, or Mac mail, even if you do so only occasionally, then you're going to need to take steps to make sure that your mail is properly routing through Radix. The easiest way to do this is to look in your mail server settings and see that your "Outbound Mail Server (SMTP)" is set to "radix.cryptio.net". If its not currently THEN DON'T CHANGE IT, but instead email us so we can have some idea of how many people we're going to need to set this up for.
The risk of sending your mail through a non-authenticated server is that as receivers start to check messages for this kind of information, they may consider your spoofed but otherwise legitimate messages to be unacceptable and they may start to reject or discard them.
Please let us know if you have any questions about these topics and we'll keep you updated on our progress.