My domain is psuaustralia.com.
ip mail server: 126.96.36.199
I don't know why I my mail server in black list of sorbs.net.
What i do to remove from black list?
This is probably because you are on shared hosting and somone else on that server has incurred the rath of sorbs.
To get delisted you need to contact them. Information available here
Or have your hosting account moved to a different server/ip range.