Yahoo is normally pretty good about this. I have been dealing with this as well but with Microsoft mail.
If Yahoo has blocked your ip then you will need to either change it or see what they have for a resolution. Make sure your dns settings are correct though for mail. You mainly need an spf record and domain keys.
Let me know if you need help with this. I have spent the past 2 weeks getting both of my servers set and I have no trouble now sending mass email out to all email addresses.
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