[amsat-bb] Working RS0ISS-1?

Hi all,

I'm just getting started with sats and tried to connect to the mailbox on the ISS this morning. I must have done the wrong thing because it didn't go how I expected. I tried to make an ordinary connection to RS0ISS-1 from VK7NTK-1 and RS0ISS-0 responded (I think to me?) with:

RS0ISS>CQ:Logged on to RS0ISS's Personal Message System<0x0d> RS0ISS>CQ:on board the International Space Station<0x0d>

This suggests to me that even the mailbox is using some sort of unproto system. I haven't seen any information anywhere about interacting with the mailbox that way. Would anyone be able to send me a link to up-to-date instructions, or explain what format it's expecting me to send, to which SSID?

Many thanks,

Tom VK7NTK