Thanks for your input!
I have tried the hot only config (without the masternodeaddr)
But when I start my masternode I got the message:
inbound port is not open. Please open it and try again. (19999 for testnet and 9999 for mainnet)
I am sure my port is open.
My .darkcoin.conf looks like this:
addnode=23.23.186.131
masternode=1
maxconnections=200
masternodeprivkey=7sDNcghj9gfgrE9ghgKbxtFp1ezLM2tiwYsDa977sejEX
listen=1
Is it really possible to appear in the masternode list with a hot only setup????