Thanks. I got:
smtp settings:
smtp type : login
login with : username
port 587 (was recommended by runbox.com)
SSL encryption

I got the errormessage: "error in socket operation. disable ssl and try again"
so I disable ssl & keep the port and get "recipient not found on server"
same with port 26
on port 25 I get "unable to connect. Check network settings"(but I know its there)

ok so I will try using TLS encryption:
port 25 : "error in socket operation. disable ssl and try again"
port 26 : "recipient not found on server"
port 587 : "recipient not found on server"

now I don't know what to do.
I really would like to get it going.
Thanks for any help.
johenkel