Get a dedicated server.
No one is going to allow you to send that many for free.
Besides if those accounts are old, your going to get a lot of bounces & blacklistings for the IP, so you better batch them to a few thousand a day using a cron'd mailling list.
Also note, yahoo is going to put a stop to them the first hit, during the first hour you start hitting them & they will 421 ya until they are happy you arent spammer, if there are a lot yahoo accts in the mailing list.
So you better have a proper reverse ptr for the servers ip its coming out of, spf & dkim on the domain.
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