As far as encryption is concerned, I believe TLS is going to be the only available option. However, we also have our sender authentication section of the interface where you can use SPF and Sender ID. (Not quite the same, but also helpful.) I believe there will be some expansion on this in a later release, but I do not have any of these particulars.

You might want to add this to the Ideas section of the forums and see if we can get this added. There are active people reviewing these forums who can review and make decisions on adding features.

Thanks!

Thanks!