First you need to find out why yahoo is actually rejecting the emails, that can be found in your server logs, there can be numerous reasons why they are rejecting it, anything from an incorrect PTR to a keyword.
@bofoo, if your on a shared server, ask the host to check the logs for you and find out what the 3 digit rejection code is for yahoo and your domain, once you have that 3 digit number, it will be easier to identify why they are rejecting it or possibly filtering it.
Once you rectify the issue, you can then request yahoo to whitelist your domain to prevent it in the future.
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