OK, have got a little further.
Can now send to external but not receiving anything.
So, if
me@example.com (ISPC) sends to
me2@xyz.com that works fine. If I reply from
me2@xyz.com to that message it disappears. No bounce, no delivery. It's probably the rollernet thing. I'll keep checking.
Also, when I log in the client it does ask for a password which it accepts.
Thanks