create ssh key & place it to server
cd /home/atmail/.ssh/
su atmail
ssh-keygen -f atmailrsync
scp atmailrsync.pub 192.168.1.7:/home/atmail/.ssh/authorized_keys connect the server with the ssh key
su atmail
ssh -i /home/atmail/.ssh/atmailrsync atmail@192.168.1.7
