I don't know a lot about my mail server as it is configured by my host.
I have about 50 email accounts on the server from 25 different domains.
I have just tried sending messages from 8 domains and all the messages got marked as junk by Yahoo Xtra. It is becoming a real pain now as I often email @xtra.co.nz addresses.
I don't send any bulk mail and checking the logs for this month their has never been more than 30 messages sent a day.
I did a quick blacklist check here: http://whatismyipaddress.com/blacklist-check
and everything came back as clean.
What can I do to stop emails going into spam?