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Thanks for spending the time to reach out to us again. I'll do my best to help you out.
Unfortunately, it is not simply a matter of whitelisting your IP address. We adhere to DMARC's policy and only allow mail from compliant and certified DMARC senders. Besides changing the information below, you would have to contact DMARC to be able to send emails to Yahoo addresses as you have been.

What you can do
In almost all cases, we recommend that you switch to sending mail from your own domain. For mailing lists, also known as "listservs," you should change your sending behavior by adding the mailing lists’ address to the "From:" line, rather than the sender’s address. Also, enter the actual user/sender address into the "Reply-To:" line.
You can also change your email client's "send as" settings to use Yahoo SMTP servers. Consult with your third-party email client's help pages, or FAQs, for information on how to change these settings.


You can find some extra information about this (and other Yahoo products) through Yahoo Help Central.