That blog entry was with respect to
incoming connections to Fastmail servers from other email services. Fastmail has also implemented opportunistic
outgoing secure connections for nearly six years:
http://blog.fastmail.com/2010/01/29/...tgoing-emails/
These incoming and outgoing encryption events are opportunistic because some email systems don't support this encryption. So if you exchange an email to or from some other service whose servers don't support encryption, your message will be handled in a non-encrypted transfer. You can usually determine if the received message was delivered via an encrypted connection by examining the full headers and looking for
using TLS in the first received header when your email provider receives the message from the sending system.
Fastmail has forced their users to use encrypted connections for over three years:
http://blog.fastmail.com/2012/07/16/...p-connections/
Bill